1. Analyze master games (so you have more ideas)
2. Don't believe crazy youtube videos (you won't learn from them)
3. Play chess games online (to learn from your mistakes)
4. Do puzzles (also can be on paper)
5. Study. Practice. Fix. Repeat. No battle can be won in the "study", and theory without practice is dead. That means not just "learning" but playing with others.
6. Play in tournaments
we all have our weaknesses.