stuck at 1250


According to your stats, you've played nearly 1200 Blitz games (mostly 3-minute) and less than 20 Daily games.
Do you really expect to improve if you don't give yourself time to think over your moves?


I would be terrible at Blitz. I'm in my 60s, and have vision problems. I need a few minutes just to examine the board and figure out where everything is.


First thing that comes to mind? Ok.
For 1 month don't play any games at all. Get a tactics book and solve them from the diagram. Don't check the answer until you think you've calculated the entire solution (this is different from online where you can guess the first move and then calculate some more if it's right).
The goal is accuracy. If a puzzle is hard, keep calculating and trying different moves. Spend as much as 30 minutes on a single puzzle.
Solve puzzles at least 1 hour every day.
During the 2nd month you can play games, but only 15|10.
You'll also change the puzzle solving habits. Now you have a time limit of 10 minutes.
After that you can go back to playing 3|0, but I recommend picking 1 day a week where you're not allowed to play blitz, and where you only play long games.
You're stuck because you never do anything different. What I outline above will probably be uncomfortable and annoying, but it will change the way you play and strengthen your ability to calculate.
Obviously you can't improve dramatically in only 2 months, so if you want to continue after that I'd say pick a topic (endgames or strategy) and get 1 good book on it, and study it. Seirawan's "Winning Chess" series of books has 1 book on endgames and 1 on strategy, you might consider one of them.

http://beginchess.com/2009/08/02/anatomy-of-a-chess-player-from-beginner-to-expert/
And
http://beginchess.com/2009/08/17/stoyko-exercises/
What has been your process of improvement like?
How did you get past plateaus, if any?

you've played a lot of blitz, analyse the games, see where your first mistakes are. play a lot of daily chess, give yourself time to think about the moves and plan your attacks moves ahead.
How can you ask yourself why you are stuck at 1250? You have access to your own games, don't you. Have you gone through them and tried to analyze the reasons for your losses? Have you tried to identify typical mistakes you make? Have you tried to look up your openings and see where you are going wrong? If you haven't done these things, you are the reason you are stuck as 1250.

Curious what kind of blitz games may surface after two months off with your formula.
Looks like you’ve played strictly blitz games so far here.
Wondering how you got to 1500 right away..

Of course I’m the reason. We all are our own reasons. And fortunately, I would add, since it means we can do something about it. ;)


I don't know how to characterize what kinds of blitz games will surface for you after doing that, but in my experience it's always along the lines of "wow, I'm seeing things I didn't used to see, and considering ideas I wasn't aware of before." This will happen pretty much anytime you push yourself to do uncomfortable exercises and learn new things in chess.
Yes, I almost exclusively play 3|0 and 1|0. Even worse, I usually play while drunk... and so of course over the last year or two I haven't improved at all
During account creation chess.com lets you pick the rating you start with... although they call it "beginner, new, intermediate, advanced, expert" (something like that anyway). You can start as high as 1800, but new accounts gain and lose 100s of points for wins and losses, so it doesn't really matter.

Why?
Because the vast majority of the games you play is fast time controls. How re you expecting to improve when youre not giving yourself time to think, and implement what youre trying to learn into your games?
Your last game: https://www.chess.com/live/game/3368428549?username=iv7mcxi
You played a 3 minute game, and make 23 moves in 1:25??? Thats a move every 3.7 seconds.