What is the best way to improve?

I'm 1400 rapid on chess.com. I was wondering (approximately) what % of my time would best be spent on studying openings, middlegames, endgames, and tactics. I'm decent at tactics, but pretty bad at everything else.

I have a question, what does pushing wood mean?

it means noob lol

Ohh okay 👍

At 1400, u still need to work on your tactics more and learn some basic middlegame themes,where the pieces belong etc and know the basic king pawn and rook endgames.

Improving at chess is usually not easy. If you can afford few lessons, I would advise getting a coach. I can teach you how to think during the chess game. After that, your progress is inevitable.

If you can't afford any lessons, here is the excerpt from very good article on how to improve:

Play a lot, analyze your games, and primarily study tactics. Your knowledge of openings, endgame, middlegame, etc. will come from analyzing your games and going over grandmaster games. Only study one of those specific topics if it is clear you are specifically losing because of that topic.

Source: https://www.gautamnarula.com/how-to-get-good-at-chess-fast/

Good luck either way!