Jae has gotten excellent at finishing. All he has to do is improve his handle. Developing some semblance of a post game couldn't hurt either.
Maybe a quick post-game for taking advantage of switches, sort of like what the Celts have done with Marcus.
I prefer for Jae to act quickly when he's got the ball in his hands, not hold onto it very long. Shoot or pass within a couple dribbles. That's when he's at his best.