1. Play less blitz games.
2. Be more willing to consider candidate moves that require a Queen sacrifice.
3. Be more vigilant towards tactical opportunities that involve a pinned piece (a king pin in particular).
4. Go over my games (especially losses).
6. Play stronger opponents, and then try to go over the game with them.
7. Learn how to deal with early bishop pins.
8. Stick with and master the openings I have selected for my repertoire (The Scotch Gambit as White, The Accelerated Dragon as Black against 1.e4, and the Nimzo-Indian against 1.d4) no matter my win record.
9. Improve my thought process, and try to use it on every move (play ‘real chess‘ 100% of the time).
10. Have fun.
Feel free to add your own list.