I personally know many college coaches from my own playing/coaching days. One who coaches at a nearby successful D3 program was kind enough to sit with my S21 for an hour, even though my son has no interest in that program. Coach simply offered to talk to S about the recruiting process so that he could be better prepared when speaking with programs of interest.
One interesting tidbit of information he shared was that he received 1200 emails last year from prospective players. Some were very well written and provided good information, while others stood out for how poor they were, simply asking “What do I need to do to get on your radar?”.
He also showed me the books they receive from the various tournament showcases with team rosters. He said he uses those books to send camp invites, even if he didn’t see the player.
The onus is really on the kid to start the communication and keep it open. Follow-up regularly, provide updates, visit, attend the camp, etc. If your kid is of interest, he’ll respond in kind. But realize they’re looking at kids in a funnel. Lots of communication at first, and then it slowly starts to filter down to fewer kids as both coach and player communicate their true interest.