Where can I find a community of bootstrapped founders?

I've stumbled across a few Discord/Slack servers and browsed them a bit, but most of the ones I've found are just full of people that don't actually run a business (but want to). Not really what I'm looking for.

I'm looking for a community of like-minded business owners to chat with, talk about challenges/growth, and maybe where I can find mentors. It doesn't strictly have to be bootstrapped founders.