It's really hard to figure out what the best approach is
You could try messaging the most active chat room in there to ask: do they know the guy they keep banning over Digit isn't doing anything but keep trying to get info? Do they think I'm just leaving and coming back, or do they get that I talk about this every day?
Another idea is you could try messaging the chat room to say there's a user safety issue you need anyone to DM you about, especially the mods or admins, and then if anyone messages you, you could explain you're trying to make sure people know there's a guy posting about a user called Digit all the time for years