Learn to focus by making focused attention meditation.
İmprove your memory. This is crutial!
Do sports.
Get up early.
No fap!
Leave social media, stop watching movies, tv series. Do dopamine detox. Tag along lesser with youtube.
Play an insturment. Read novels. Write stories. Do art. Dont leave them before finishing.
Solve puzzles.
Argue with people. Learn philosophy, politics, science, psychology, crime. Discuss them with people all the way