John, my son was in the same position last year. I'll make a couple of points about our experience.
First off, I was sitting in a restaurant one night before the HS season started. I had on a hat that was similar to the hat the HS team wears. I was a coach of travel team with the same name. A dad came up to me and asked if I was a coach. I told him yes (thinking he was talking about sons travel team). He proceeded to tell me how good his son was. On and on. When I realized he was talking about the HS team, I told him I was not a HS coach and asked him who his son was. He told me and I knew his kid. To put it lightly, his son was not a good player at all. Pretty bad really. But it made me think about something. If this dad went to the HS coach and told him how good his son is, and I went to the HS coach and told him how good my son is, how would the coach really know? I got thinking how many parents must come to the coach to say how good their kid is, then when they get on the field, they see the reality. I'm sure the coach just ignores anything the parents say and let the kids performance do the talking. I never tried to promote my son to the coach. Figured it was worthless anyway.
I was talking to the coach after the preseason parent meeting and let him know my son was a pitcher and he told me he already knew about him. It surprised me because I didn't think they had any idea. My point is the coaches often do their homework and know of the good kids already.
The other point I wanted to make is that the kids often want to play with their friends. My son did make varsity, but often said that he wishes he could have played some freshman games so he could be with his friends. There was one other freshman who wound up being called up, but, he was up there with all the big kids and didn't know many of them very well. He did well at the varsity level, was one of 3 starting pitchers, but part of that was because our pitching staff was not that strong. If he would have played at the HS across town, he would not have made varsity and I'm sure would have been happy playing JV.
You have received a lot of good advice here. Bottom line is, things are out of your control now. Like others have said, sit back and enjoy the ride. He will have his chances when the time is right for him and for your team.
Good luck in tryouts!!