Would you be willing to publish/sell the source code? It would be good to have an alternative to Discourse and by the sounds of it looks like your app was solid.
I never open sourced it, but if it could help keep up some communities online I would happily donate it.
You get the friction-free experience of a chat when it comes to UX, but with the advantages of a forum such as threads, searchability (being indexed by search engines), etc.
This would be a really nice alternative to the current status quo where it's either Discourse (nice as a forum, but not ideal as a real-time chat) or Discord/Slack/IRC (nice as a chat, but siloed and not searchable).