Already been mentioned but go to as many games as possible
If it is something within budget try to take your kid and some of his teammates out to dinner. They're broke college kids so they'll appreciate it, but also you get different perspectives on the program and maybe some things the other kids are also struggling with. I thought mine was having a hard time getting adjusted. They all were.
I'm actually going to disagree with some on here and say that you don't have to root for the other kids in direct competition with your son. But just because you're not rooting for them, doesn't mean you need to root against the team, and it definitely doesn't mean you need to talk about it with other parents.
Other than that enjoy it. I was having the best time prior to the covid shutdown. Due to the nature of the schedule this year I didn't get out to see as much. I'm looking forward to next Feb, hopefully somewhere warm.