It's been a while since I spun up Logseq—are you able to use it collaboratively?
That's the biggest obstacle for me with these personal knowledge management apps. They're nice to use individually, but when I need to collaborate with someone, there's no way to delegate access—much less granular access.
I haven't tried since I don't have anyone I need to use it with, but there's a way to set it to back up and sync using git (since they're all markdown files anyway). It wouldn't be real-time (you couldn't both have a document open at once), and you'd probably have to remember to push your changes.
Syncthing might also work in a rather hacky way, but would probably also run into real-time collisions.
I recently deployed getoutline.com to my personal kubernetes cluster. It's free to self-host and everything is saved in markdown. It also has collaborative features.
I believe it's intended for documentation. But I use it as my note taking app.
