Here is some great advice from Logan Kosmalski, Co-Founder of Pro Skills Basketball. This advice applies to all sports, not just hoops. The phrase I use to summarize this piece is “Be the kid the coach wants on the team”.
The three main points Logan makes are all “mental” in nature, and that means your player can implement them on the spot, simply by having the right attitude
Lastly, of course, a fourth point if you will, you could bring your kid to Champions and get faster, stronger, and more confident. That would not hurt their chances one bit!