why no one can effectively improve their ratings to 2000s ? people say analyze your games, solve puzzles and study endgames..
alright how come i see a ten years old kids having 2000? when on earth did they do these, kiddo was peeing his pants last year
there is something wrong with these suggestions, it feels like people just fool you into something that isnt real at all..
and again.. can we really improve??
First off, remember that some people have a natural aptitude or ability (physical, mental, etc.) that others simply don't and can't.
Quite frankly, most of us have a limit as to how good we can really ever get. There's nothing to be ashamed of. If you could ever reach a point, for however short it is, that you reached 2000, you would be in a very small minority of players that have ever played period.
Make no mistake, no one is a "prodigy" who doesn't do the work. You'll never see the hard work that goes into making one great at anything, what you see are the outcomes.
I've learned to be "_________", (applies to any endeavor you pursue) you have to first be that when no one sees it. You could be a great golfer, or coder, or accountant, or husband/wife, it doesn't matter. But before you are recognized for it, you have developed the habits that make you that every day, and when the opportunities come for those skills to shine, only then do you see the extraordinary outcomes.
Do not believe that it comes easy for anyone. To be great at anything, you have to do the work to be great.
This again is quite true. Before I became decent chessplayer (although there is still far much to do and lot more to climb) I did read lots of books, seen lots of positions, analysed lots of games... The hours you put in will not be lost if you are looking to improve.
Same it took me to become better father. Lots of sweat, tears but you need to learn from past mistakes, examine each situation with little distance. I agree with everyone who posted advice in this direction here. There is already a lot of good advice in this topic. I like it!
And not just titled player but also a strong player! Thesse guys usually don't want to coach and are expensive! So I get your sentiment! 
You need to get more students. I knew students who will be so difficult to coach, even you would not get them to 1950 in 10 years. But these are special kind, almost everyone has the ability to learn with the right guidance or attitude.
Improving at Chess is no different than improving at anything else you do in life.
Books don't offer structured learning, they offer information.
There is no "magic bullet", or one size fits all approach.
If you really want to get good at anything, including chess, you will need to invest time and money into it. Set goals, measure yourself, hit milestones, keep disciplined.
It's actually quite clear how to do it, it's how hard you want to work at it.
fancy words but mixed points..
you generalized the subject, we need more spesific points since we already 'are' trying.. no one is asking for a magic bullet though, I'm already asking for 'a way'.. read the first post see I'm already trying but not making significant progress.. that's whole point
I once got to 1400 doing nothing but puzzles and tactics. Barely knew any openings. All Rapid though, terrible at Blitz, much less Bullet. Thing was, most of my tactics the engine thought were bad moves, a lot of sacrifices and all out attacks, but they worked based on the level I was at. I was solid with pawn endgames and traded queens often. Also, I think I took a long time so people would lose engagement (not intentionally) but it did hit a limit.
I stepped away for a while due to work and came back, forgot everything I learned. This time I bought Openings courses to set myself up better and learn some strategy behind what I was trying to do. I've gotten quite good at book moves in some variations up to 7-9 moves. But I have hit sticking point. Middle game tactics.
But to get good at openings I practiced them over and over and over. I took notes, starting keeping notations, did drills, dedicated time to recognizing best moves when they occurred.
I just began working on middle game again with a new course and more puzzles and tactics training.
I set a goal to get comfortable with openings 65% of the time. I exceeded that. But its hit a wall, and its the middle game. Now comes time to think about those tactics, sacrifices, and drills.
I spent time and money. I don't just do one game after another. I go back through mistakes and check against best outcomes.
I got to 900 Blitz last week with this, but on vacation on a cruise with a little too much of the drink package.... oops.
Back to dedicating hour of day to training.
This also doesnt look like healthy training to me