He really, really needs to work on his whining and complaining to the officials. I say that only partially tongue in cheek. He gets so few calls when he goes up strong and gets hammered that I think it's having a detrimental effect on his development when it comes to finishing at the hoop. If you continue to take it up strong, and defenders are continuously allowed to hack you, resulting in you coming away with nothing, it's going to result in changing your approach, and I believe that's what we see from Jaylen quite a bit. Instead of going up strong, he'll do everything he can to avoid contact, usually in mid-air, and end up taking some kind of circus shot just so he can get the ball cleanly to the rim. Or he gets tentative, and that's when he hesitates for a split second, and someone comes along and strips him.
He needs to figure out how to sell these calls and get them from the refs. Maybe not so much whining and complaining, but when he gets hit, he needs to make sure the refs know he got hit, whether it means he goes to the ground more, yells in pain or whatever, he can't wait until after the play is over to get on the refs because it's too late, he needs to sell it during the moment, the way guys like Harden and Westbrook and Lebron do. Once he starts getting these calls and getting to the line, I think we'll see that confidence return, and he'll start going strong at the rim like we've seen him do on many occasions.
And when he does go strong to the hoop, he needs to remember he can simply jump over most of the guys in the league and instead of trying to make some pretty finger roll, or lay it in with the left, just dunk the damn ball. Dunk it hard, dunk it often and dunk it on people. He seems to pass up a lot of dunks for layups when he's in traffic, and again, i think it relates to the lack of calls more than anything, but he needs to use his athleticism to it's fullest advantage and that means flushing it in someone's face on a nightly basis.