As some one was mentioning in the comments, https://microsaashq.com is one the communities out there and I run this community. Its primarily an async community for conversations.

Also, note that its not just a simple community but its a massive ecosystem for Micro SaaS builders with niche reports (detailed reports for multiple ideas in a given niche along with a lot of analysis on technical chops, marketing chops, competitor analysis etc, costs analysis to implement an idea). We also recently launched Founder Insights series with Founder Interviews from 1000+ founders mapped to each niche.

And to answer your original question around communities - Our community has all conversations ranging from mental health to idea feedback to landing pages feedback to sharing wins/loses with some weekly streaks/monthly streaks.

Would be happy to answer any questions. I am a builder and I myself took a few of these models and implemented successfully.