How blitz worsen my game

I've lost over 150 points in the last year even though I played almost every day since then. I have been doing lots of puzzles, where I also began losing ELO. This is the story of my chess failure.
     I have been playing chess for about two years now, and I feel like I not only stopped improving but also began to play worse. In the beginning I got hooked up by the “climbing the ladder” process which I found really exciting. Discovering new ideas and getting feel of the game kept me going. I Improved well, in the first year I went from 1000 to 1400 rating points, hitting the roof of 1430 ELO. I felt Great about my game I played confidently, I switched my focus from strict material advantage to positional dominance.
     I started playing at a chess club, I played only a game a week there. We played 1 hour 50 min per side and I did great there. In the beginning I was able to trick much more experienced opponents than myself. Even though I didn't have any chess knowledge at the time nor positional experience, I was completely sucked in by the chess board. By then I bought premium on chess.com and began practicing. Mainly by playing 3+2 blitz or puzzle rush.
     By playing blitz I developed opening theory and foolish move-repetition which later killed my chess imagination. It was also the moment when I started losing my ELO. Soon after I had to leave the chess club, cause of my inconvenient work hours. I stopped analyzing my games, not only because it was easier to just hit the play button, but my mistakes seemed obvious and I felt like I didn't have to analyze anything anymore.
Now a year later I'm stuck in the Folsom prison with 1270 ELO. My colleagues have already surpassed me in every possible way. Should I quit blitz? Or maybe switch and go pro curling?

You seem do know what you did wrong. Why not go back to what worked?

Stop playing puzzle rush (if you solve puzzles, do them in training mode without time preassure). Stop playing the damn blitz and play 15/10 time control or if you want to play livechess, otherwise play daily chess. Play less games, buy diamond and begin analyzing your games again.

Im only 850 yet but I clearly see that with short time controls I do not have time to think as much. And as I improve (gone from 600 to 850 ish) I see that I, if playing 10 min games without increment, begin to run out of time beacuse I am able to think more. Of course if you play 3/2 you wont have time to think, analyse deaply etc and instead will use memorized combinations and intuition. How would you expect to keep your analyzing skills if you do not have time to think for lets say 3 min a few times each game at least, without crazy time pressure. 

Same with puzzle rush, whats the point in solving them so fast? You were not high rated at your peak, you still make blunders, you have so much theory and tactics to learn that you don't know. 

Thank you for your reply. You are right. Speed-chess is poisonous and as Fischer said: "It kills creativity and ideas." But the biggest problem with it (by far) is that it is just simply fun. To emphasize - blitz not only feels up your time, but also makes slow chess seem boring, therefor switching back to slow-chess is simply difficult.

Yes blitz is fun. I play it a lot too. But play some at least 15/10 sometimes. It is still quite fast but you have more time to think, I do not think playing blitz will ruin your play (grandmasters play like only blitz here on chess.com), but ONLY playing blitz will. 

Speed/Rapid chess tends to be primarily an exercise in moving pieces around faster than your opponent while avoiding checkmate, in hopes that his/her clock runs out sooner than yours.  There is little time to think about what you should be doing.

It makes sense that taking more time to think about what you should be doing would promote improvement in your chess skills.

An effective way to improve your chess is therefore to play mostly longer time controls, including "daily" chess, so you have time to think about what you should be doing.

This is not to suggest that you should necessarily play exclusively slow time controls or daily games, but they should be a significant percentage of your games, at least as much, if not more so than speed games which do almost nothing to promote an understanding of how to play the game well.

Here's what IM Jeremy Silman (well-known chess book author) has to say on the topic...

https://www.chess.com/article/view/longer-time-controls-are-more-instructive

And Dan Heisman, famous chess teacher and chess book author…
https://web.archive.org/web/20140627052239/http:/www.chesscafe.com/text/heisman16.pdf

https://www.chess.com/blog/RussBell/dan-heisman-resources

and the experience of a FIDE Master...

https://www.chess.com/forum/view/general/how-blitz-and-bullet-rotted-my-brain-don-t-let-it-rot-yours 

for some good stuff on general chess improvement, with a view toward learning what you should be doing, browse my blog.....

https://www.chess.com/blog/RussBell

Thanks had a look at some of the things on your blog. Will definitely look into it deeper

15+10 is not slow chess and even 30 min can be played in less than 10 min for your side if your opponent is weak.

I know at least one GM that refuse to play blitz here or anywhere because it's not good for his improvement and he play only 15+10 or slower....

 Most of them do not beacuse of cheaters. It is too easy to cheat with longer time controls, way harder in blitz. Thats why.

"... I have strong anecdotal evidence that balancing slow and fast chess practice provides optimum benefits … . In my experience, students who play fast chess almost exclusively have problems visualizing (moving pieces around in their head), they often play the occasional slow game too quickly, and have difficulty in planning and endgames. Players who play only slow chess have difficulty learning their openings, recognizing critical positions and basic tactical patterns, and often panic in time trouble. The best solution, as in many things, is a healthy balance. I would guess up to ninety percent of your playing time should be slow games (thirty minutes for each player or preferably more) and the other ten percent speed games. ..." - NM Dan Heisman (2009)

https://web.archive.org/web/20140627020325/http://www.chesscafe.com/text/heisman100.pdf

If you want to improve blitz is not very good, it took me more than a year to realize of that simple true, you improve when you think, I have over 2000+ in blitz and I can say I dont think in blitz, play slow and do tactics, if you want some extra help message me, I give a free lesson to people that wants to improve

Quitting speed chess can be a gradual process. Play only 5 minutes chess and longer. After a month, play only 5/5 and longer. Another month 10/0 and longer. Then 15/0. Then 15/10. 15/10 would make good sparring games preparing for OTB tournament games.

I just checked your last game.

You reached this position, and then played, h3? b3? etc, a kind of aimless moves that waste your tempo.

It shows you need basic opening repertorie.  Playing long games wont give you those knowledge. Learn from master games or opening book is a good choice.

What will I do? 

Just before you reach that position, I wont castle , O-O. Instead, I will do h4!, h5, g4!! push .

Keep the king in middle and O-O-O later. As black kt is misplaced, it is a good chance to attack.

In fact, putting two knights on c3, f3 and two pawns in e4, d4 is a bad opening set up cos it is very hard to expand after opening. There should be c4, d4, e4 pawns set up or d4, e4, f4 pawns set up when black allow you total control of centre.

This is evidence of how castling should not be the ultimate option when virtually unable to think up a move. You have to analyse the situation deeply and positionally to excel like a monstrous master. 

I experienced a drop in rating a few months ago, it was because i played too many games (specially fast time control) and started getting too tired to think, calculate & analyse. Now i greatly reduced the amount of games i play, stick to long time controls and make sure i take my time to ask for my opponents reply before making any move and always consider basic tactics (checks, captures & threats). Now my rating is starting to go up as well as my enthusiasm for the game.

By the way, the rating on this site is NOT elo points, chess.com has a different rating system.

Hmmmm, that's an interesting idea!

Thanks for your reply, you are right -- after I went through the feedback underneath this article I realize I should just stop playing blitz at least for some time now. I'd be great if you could help me, I never had a coach so if you have time I'm up for it!

I was only considering going full pro, so I'm not interested in online-curling arenas. ps these things are easy to solve. The real problem is where do I find pro broomers willing to help.

Hi all, I stream chess for 1200-1800 Rated players,I solve tactics, plays with viewers, puzzle battle wth CM's, long blitz games for analzing purpose too. Do checkout and Drop me a follow on twitch.tv/corporatechessguy if you like it. Lets learn Play and grow together!Happy to help! :) :) Just send with a Fdz request on chessdotcom and let's get started!