i’m a smaller guard. what skills, habits, and drills helped you become a dominant player? i’m looking for things that actually work in games, not just highlight moves

I'm 5'8" and not very athletic. I want to improve my decision-making, be more athletic, and generally become a very skilled player. What should I work on during the offseason? Or any other advice? Thank you guys, God bless youu(Jesus is King)