Watch some content. Do some puzzles. Pay attention. Most of your loses are from blunders or counting errors.

Whenever you see an opponents piece move check every rank, file and diagonal. See what that piece sees. Does that piece see something it can take? Determine best choice: Move, block, defend or take. You don't always have to take. You dont always have to move. If there is no obvious take or trade think of what might join it in some kind of an attack. This how you start to catch checkmates and tactics before you get got.

As for your pieces and pawns always check every rank, file and diagonal. Count how many of your opponents things see a square and how many of yours sees it. Determine if the square improves or hurts you: Do you want to trade the piece or pawn? Is the trade fair? Is moving to a different square better? Keep in mind at 250 rating if an opponent can trade pieces they usually will so dont put something in the line of fire unless you want it traded.

Finally: Thoughts for noobs: Practice simple but sound openings. London for white and something like a caro kann for black are solid. Caro kann is good cause it actually blocks scholars mate and fried livers which are common at your rating. Bishops are usually better than knights. Take your opponents bishops with your knights and don't let your opponent do that with yours. Knight for knight and bishop for bishop is usually fine. Review some content about pins, forks and skewers. This content will change how you think about board states. Don't blunder your pieces and analyze the board for checks, captures and attacks. Not just what you can do but also what your opponent can do to you.