First and foremost, your son is not "behind". Sure there's a p5 track where 2022 kids have gotten signed, but for the most part as long as you're in the game by summer of rising Junior year you're good. For a kid with good grades put an emphasis on Headfirst and Showball, those are the two best bangs for the buck next summer. IMO far ahead of individual school camps (those may have more value fall of Junior year). As someone suggested earlier get your kid on a strong travel team with a connected coach. And lastly, over the quiet period have your kid train like a fiend. Add weight, muscle, strength and flexibility. Take this time to train like a full-time D1 athlete if that's what he desires to be.