Sorry to hear you are closing this community. I didn’t contribute as much as I would like to (busy myself animating other communities, and real life stuff too). Do you want to try advertising this community once more to larger communities like !casualconversation ? Maybe that could help getting better people on board.
Also, you might want to have a look at tildes.net . This website is heavily focused on discussion, so maybe the issue you have is that people that could be interested in your community are already there