All your son can do is his best. What you can do for him is provide resources you can afford. Help him be aware of what's required to succeed at the next rung up the ladder. Look for the best travel team where he can grow and develop. For summer ball it's time to stop playing age appropriate level and start thinking skill appropriate. Once he's made varsity or playing on a quality 17U team develop a college strategy.
It appears he has some quality accomplishments for his age. Don't let him rest on his accomplishments. A lot of kids will be developing physically over the next two, three years. Pat him on the back but keep challenging him. Good luck.