I've been running a very shitty threaded message board for years ("running" being a very loose term - I mean it's still there). There is a parallel facebook group that exists solely to tell me when I've f'd up.
The people still on it, are the people who use it as a "separate space" to all the rest of the bazillion dollar alternatives - hellbent on shoving adverts, tracking and all the rest.
I'm only going off on this tangent, as maybe what appears to be lack of traction, could also be (if you squint hard) a benefit. Could you cookie-cutter out instances of your product?
If you can, then maybe you could position it as a micro-ecosystem for events people don't immediately want to integrate into their existing mega-social world.
e.g. Weddings.
Could on-board all people invited to the app (click this link to say if you're going or not), let them get to know each other a bit first, share photos they took of the event, plan stag events, enter dietary requirements, link to the wedding list, buy a nice photo from the official photographer, send a message to that bridesmaid you thought you were getting on well with, click on faces in photos to see who they are etc etc.