I am a quite decent chess player but I have always been wandering around 1300 rapid on lichess since when my rating was established. I feel like I really need to improve. Any suggestions? The lichess puzzles aren't working for me btw.

Let us look at an example
You play way too fast. Slow down. Take time to think.
To eliminate blunders, activate move confirmation in your profile. Think about your move, play it, check it is no blunder, then confirm it.
Whenever you lose a game, you should analyse it thoroughly. Use the learn from your mistakes feature: that makes puzzles out of your own game.

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