But all your ratings show 1200
Stuck at 1400 rating

I realize that I'm not good at improving my position.Sometimes I don't know what I have to do it the situation that is equal for both sides . the others reason is that I often make a blunders.
Since I have realized all these things.I try to improve my chess by doing tactic puzzle 15-20 puzzles per day(I count only the problem that I solve by myself)
My question is How can I forming a plan in the middle game ?and how can I improve my positional playing skill?.
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Possibly helpful:
The Most Instructive Games of Chess Ever Played by Irving Chernev (1965)
https://chessbookreviews.wordpress.com/2015/03/01/chernev-soltis/
Simple Attacking Plans by Fred Wilson (2012)
https://web.archive.org/web/20140708090402/http://www.chesscafe.com/text/review874.pdf
Chess Strategy for Kids by Thomas Engqvist
http://www.gambitbooks.com/pdfs/Chess_Strategy_for_Kids.pdf
Starting Out: Attacking Play by James Plaskett
https://web.archive.org/web/20140708101549/http://www.chesscafe.com/text/review467.pdf
Essential Chess Lessons by Steve Giddins
https://web.archive.org/web/20140708100833/http://www.chesscafe.com/text/review534.pdf
Simple Chess by Michael Stean
https://web.archive.org/web/20140708104258/http://www.chesscafe.com/text/review400.pdf
Amateur's Mind by Jeremy Silman
https://web.archive.org/web/20140708094419/http://www.chesscafe.com/text/ammind.pdf
Chess Training for Post-beginners by Yaroslav Srokovski
https://web.archive.org/web/20140712013538/http://www.chesscafe.com/text/review945.pdf
Chess Strategy: Move by Move by Adam Hunt
https://web.archive.org/web/20140708093249/http://www.chesscafe.com/text/review890.pdf
The Power of Pawns by GM Jörg Hickl (2016)
https://www.newinchess.com/Shop/Images/Pdfs/9034.pdf
I realize that I'm not good at improving my position.Sometimes I don't know what I have to do it the situation that is equal for both sides . the others reason is that I often make a blunders.
Since I have realized all these things.I try to improve my chess by doing tactic puzzle 15-20 puzzles per day(I count only the problem that I solve by myself)
My question is How can I forming a plan in the middle game ?and how can I improve my positional playing skill?.