You could have actual substantive discussion on /r/chapo which was good. The combination of being relatively lax and not trying to establish orthodoxy and not giving trolls and bad faith right wingers anything they wanted broadly worked. It avoided fiascos like /r/antiwork and socialist cat girls.

I'm only on niche hobbyist, academic and bdsm subreddits, of which the latter kinda suck - there's a lot of easy moralism there. Small enough groups and you can drift to your favorites over time. The wider culture is either mundane or bad.