Your son should find a travel program for the fall and get on the stick with his recruiting.
He should join the very best team that will play him regularly.
It is fair to ask the travel coach what his playing time will be. "Coach, we do not question your authority, but if in your judgment he is not good enough to see the field on your team, then I hope you can understand we need to move on to another team."
To me, your tale is all too common among players who eschew recruiting-oriented travel teams in reliance upon HS and Legion. Happily, it's not necessarily too late, though obviously earlier would've been better. Good luck.