Am i decent for a 400 elo?/what should i do to improve?

I'm a 400 elo player, around 780 in puzzles and can consistently beat the ~1000 elo bots. I'm wondering if there is anything i could do to improve(i struggle with mate in 3+ puzzles quite a bit). For refrence on my style of play, here is my most recent game(in which i actually got 2 great moves!): https://www.chess.com/analysis/game/live/70917391389?tab=review

You should learn most important principles of a chess game. That will give you a solid understanding of a chess game and you will know what to do in every position. Then, you should optimize your calculation so you don't miss tactics in your games. Your rating will skyrocket. I can help you with all of this. Message me if you are interested.

Once I was also a 400 elo player but then I started to analyze me old games and understand my mistakes. Now I make less mistakes and I have reached 686 elo

Improving Your Chess - Resources for Beginners and Beyond.....
https://www.chess.com/blog/RussBell/improving-your-chess-resources-for-beginners-and-beyond
https://www.chess.com/blog/RussBell

The best way to improve your chess at the beginning is by learning the opening principles

The game you shared was a good game, you played very well. However, more can be learned from the other games. I picked I game you lost at random to analyze. It was a game vs IdreesChess.

Here is my analysis

In summary:

• Opening principles are good
• Board vision is lacking
• Too many moves without thinking

The only thing I can add is that the check with the rook is probably a check for the sake of it. Checking with the other rook would have been a better move. I'm not going to say it's a good move because I'm 700, but it gets that rook into the action and doesn't allow the king to attack either rook.