How do I get better?

I’ve played basketball most my life, but contrary to popular belief, I suck. And I’ve worked so hard and even harder to get better but I seem to just be stuck in the same spot of I’m good at something, yet I seem to not be able to show it. Like I was at a tryout and we did a scrimmage and I seemed to just lose all my previous talent, please tell me tips or way I can improve. I also struggle to show in game dribbling skills although I’m good at it due to low confidence, how do I fix this?