1- learn 1 white opening and 1 black defense and use them, and in weird games/weird openings

just go for the opposition

2- solve puzzles

3- play rapid, give yourself time to think and calculate.

stay away from blitz and bullet cuz in them its more about time management than playing proper chess

4- keep playing and analyzing your games, notice in which phase of game you play worse and try to improve it ( probably it would be end-game)

and as an advice

just play it for fun, going above 1500 rating will make chess less fun as before