Learn from your own games - not so easy sometimes...

This is my latest slow OTB tournament game. After going through it as good as i could, i found that:

• I could have chosen a more aggressive opening by playing d5 instead of e6.
• At move 16 i made a mistake by not pay enough attention to the forcing moves that my opponent has available.
• At move 31 i missed that i could safely regain a pawn by focusing on one idea too much and "forgetting" to re-evaluate the position from move to move.

So the lessons i will take with me is to try playing as active as possible, pay more attention to my opponents threats, re-evaluate the position more often and not focus on a single idea too much. These are general issues though, that i struggle with in every single game.

After running the game through stockfish, it basically says that most of my moves are either a mistake or inaccuracy. Some of the alternative moves it suggests are strange looking or sacrificing a pawn without a (to me) clear compensation. Is this simply a result of me being a 1200 player or is there any generic rules & principles i have missed or something else i could learn & improve on?

Difficult to follow the game with these pieces!

Or 4. b3, which transposes to the Nimzowitsch/Larsen Opening 1. b3. I am giving the lines from GM Alex Colovic's book "A Grandmaster Guide: The Reti (etc.)", available in Chessable.

According to Colovic, in the Stonewall structure White's bishop on d3 is the best piece, so better to exchange it as soon as possible.

White employs the development from the Leningrad Dutch.

Preparing the fianchetto of the bishop on c8 but at the same time gaining space on the queenside.

Seemed like the manoeuvre designed to improve the worst placed piece, just put it in a worse position!