Ask HN: Online communities like the initial YC StartupSchool experience?

I was part of YC's initial StartupSchool batch in 2019 (?), and back then we had groups of maybe 5-10 startups which were mentored by a YC alumn. Every week we would have a video conference where people would share their progress and we'd discuss problems together. I know YC still runs StartupSchool but it seems they only do founder matching and online courses, the initial experience was much more useful though (I can understand that it was probably too much effort for them to maintain).

I found this really great and I'm looking for something like that again. Does anyone know if communities like that exist somewhere?