Ask IH: Ideas of a Flywheel for a coaching/training business?

I am thinking about how I could apply this flywheel principle to a coaching/training business. Roughly following Sam Ovens definition, every new customer in the flywheel should make the experiences better for the next customer.

The most obvious is to start some kind of community. Followed by a knowledge base and recordings of group session or Q/A sessions

However, I guess there are more options but I do not see them and hope for the ih wisdom :-) What else could you think of? What else would get better with each customer?

I leave out the topic of the training biz intentionally as I believe it helps more makers if it is topic agnostic. It are probably the same candidates anyways.