Highly attended tournaments like Surf, Dallas, Jefferson Cup, etc
Postseason play or showcases on national platforms like MLSnext, ECNL, NPL, etc. CIF High school postseason
Highlight reel video is always important to have so you can share that with perspective schools and coaches.
ID camp would be down on the priority list and really only after your player has had individual personalized contact or interest from some of those colleges.
One of the best sources should be players current club or HS coaches, they should have contacts and work with the college coordinators.
Remember communications and keeping up with the coaches is going to be the key. Your players going to have to go to them they're not going to go to your player