Have you ever used a forum powered by Flarum before? Or have you ever tried this software out? It's similar to Discourse and NodeBB but unlike those two you can upload this to shared hosting! There's also a free forum host called Free Flarum where you don't have to worry about installing the software yourself. I currently am using it for a Sonic forum though it's basically for testing purposes mostly.
https://freeflarum.com/
