Protect his arm a let him enjoy the game, as well as enjoying being a boy. There’s many different philosophies about youth baseball, and more than one approach to developing youth pitching.
Velocity is very sexy in youth baseball, but youth baseball is not the end of all ends. What I mean is my son was clocked at 68 at 11 by the local baseball academy. He’s dominated every league/every game. I asked if there was something they could recommend to improve his delivery, and the “pros” answer went this way: “What Travel team does he play for?” I answered none, he’s just a kid. Whether he played travel ball or not had nothing to do with my question. I summed up they thought I was a clueless hillbilly, so they followed with “he has some potential”, giving glances to each other and thinking $$. “Given enough time and instruction (at $100/hour), he could become an OK pitcher for his age.” Thanks, but no thanks. All some people will see is $$.