Honestly, though my reddit usage is way down there are some conversations on reddit that can't be replicated. I read manga / watch anime from years ago that no one is talking about now. Reddit has a comment history that goes back a decade; really hard to compete with that.
There's one sub I frequented which has gone private, and one of the posts from a similar sub mentioned how it's the only place on the internet to really have a deposit for decent conversations. I know Discord exists but Reddit's format is better, imo. That's the thing I miss the most - but ultimately, the content on Reddit has become so much click-bait bullshit that I wasn't really getting much out of it anyway.