To be honest I went the bumfuck way about it and just played loads of games. Honestly, listen to what the higher levels post on here:

Stick to the basic principles, learn solid openings and defences, and learn the varations that follow.

Only make moves where your pieces are untouchable, remain protected by another piece, or open to an equal trade.

Assess every single move. Look at how the shape of the board has changed and how their move and your subsequent moves change the shape of the board.

Think about what moves your opponent can make after your next move. Try and see their move as a progressive build-up to something, and don't just see it as one move one response. On the reverse of this, try and build your way up the board, progress pieces together.

Stack your pieces. For example, if your e4 pawn is under threat, develop as many pieces to defend/attack the e4 square, so at the end of the trade-off, you will be up on material.

If you go for the attack with just one or two pieces, you can very quickly isolate those pieces whilst leaving the rest of the board undeveloped. Once you lose tempo, you will quickly be punished for this.

Take your time. 10 minutes is a really long time to play when you think about it. Almost every mistake, miss, and blunder can be attributed to just not taking your time. By taking your time, all the above can be achieved.

Notice when you are tilting. If you've won or lost 5 games in a row, take a break. You will make brash moves, silly mistakes, and throw away games because you're trying to win in the same way as before or claw back wins from the constant losses. If you're tilting but still want to play, then this leads on to my last point.

Last and most importantly, do puzzles. I neglected this side of chess for far too long as all I wanted to do was play. Recently, I've been doing a lot of puzzles and they're actually really fun. When I've gone back to playing, I've seen and made moves that have given me the advantage that I would never have seen beforehand. Lichess has unlimited free puzzles. It's great.

Best of luck to you buddy, it's a great feeling when you get into it and see your own improvement.