Personal goals

That's where the 'playing the player' bit comes in. Which is where you evaluate the quality of the player before making moves or calling a raise.

When not in hands, work out the players who play lots of hands but fold to bets, ones that play few hands but win them etc. See how someone bets on a scary board and how the opponent reacts. You are looking for their patterns in common situations.

Once you've figured some of the obove you can use betting to establish the quality of your hands versus different players, and crucially use betting to build pots and steal under the right conditions.

Put a post-it-note on your monitor with notes on your weaknesses to remind you when situations come up that you mostly lose but can't let go.
EG.
1) Fold JJ when overcards are on the board and you are bet into.
2) Stop chasing straights and flushes against big bets.
3) Don't always call an all in with medium pocket pairs.

Unfortunately all the above comes at the price of taking the fun element of the game where you really need to focus on what happening, and not just when you are in a hand. But if you losing money overall then this is what you need to do to turn things around.