What is the best strategy to get specific users for B2C?

Hi everyone, my startup is helping sports roles to easily share insights into real game clips with just clicks.
We started with basketball coaches and already got 175 users at this time. But we face some challenges:
1. We haven't find the best channels to reach out coaches. We tried reddit, fb, and discord; got some users but stuck. We also have twitter and Instagram sometimes got users reach out but just a little.
2. Basketball coaches are quite busy during the season. Before season, I typically have at least 10 meetings with coaches weekly. It would be 1-3 meetings during the season and hard to reach out new users.
3. Coaches are not familiar with tech so you have to do the demo or showcase how easily to use our tool before they are willing to try. That means cold reach has limited result.

Would love any organic marketing tips that could get our first few thousand users.

Cheers!