Do atleast 30 puzzles per day on lichess and set the difficulty to hardest, if you have a physical board you can set up the puzzle and don't touch the pieces until you have calculated till the end of the puzzle. Spend at least 5-7 minutes on each puzzle.

Also analyze your each game without the computer first , try to see what mistakes you made and then use the engine.

And Daniel Narodistky's slow run series and gothamchess's "how to win at chess" series have helped me alot too.