I don’t. Discord is trash, forums forever.

Just in general this is a problem with Discord. It locks everything that you can find on the internet with open standards, behind closed standards of a walled garden. Conversations, threads, are all disorganized and unsearchable using traditional means.

Filtering searches by channel can help a lot. If you're trying to understand how a specific feature works and there's a "rules and mechanics discussion" channel then you can search that channel specifically for the feature. But generally I'm afraid there is not a good answer here. Discord is a lot worse than classic forums at this kind of thing

I'm a mod on a fairly large D&D homebrew discord (12.7k members). I agree that it does get difficult to track what's going on as our server grows.

We try our best to categorically organize our server in a way that facilitates dozens of discussions at once. It works pretty well, but no one is expected to be able to track all discussions at once, so we do rely on the users to ping the mods if needed.

I personally have a few select channels favorited and check them pretty often. If a conversation is interesting I'll join it. If I want to talk/ask about a specific thing I just ask on the respective channel. If I need specific information I'll do a quick search or ask on the quick questions chat.