stuck in 900s

Avoid blundering your's.

I wanted to write avoid blundering your materials.Recognize blunders of your opponent.Just follow the basics.You could hit 1000 easily.

Play slower. I took a look a several of your recent losses and you more often then not have more time than you started with by move 25. There isn't any point in playing 15/10 if you don't use that time to calculate. Just play blitz if you wanna go fast.

Board vision is useful just being able to see bishops more than 3 squares away and those night forks might be helpful

Puzzles is good for training things like "oh free piece " or "mate in oneo" ccasionally but unless you do deep studies it doesn't teach the positional or strategic aspect at all I would recommend trying to limit tunnel vision as much as possible (btw if it happens to you it is also likely happen to your opponents so use it to your advantage ) but a good way to get better at tactics is to get better at strategy typically is better to learn that while either analyzing games (better if you don't listen to stockfish every move and come up with an actual reason ) tactics are everything but you get tactics by making complicated positions for your opponent ,or your opponent just making a dumb move 

Just make sure to think in blitz and try new things come up with different strategies

But how do you follow the basics Plenty of 500s know them but they don't do it correctly following the basics doesn't help f you do dumb stuff like hang pieces in one move 3 times in a game or resign in one move due to rage quiting (even tho anyone below 1800 probably doesn't know when to resign )