Notes disappeared but folders still visible

Things I have tried

Hi all, I have been using Obsidian happily for a few months but my notes all of a sudden disappeared a few days ago. I double checked file recovery feature but only a very of few of my notes visible there and I recovered but most of them are missing.

See below folder structure. All of the notes under have been disappeared. Any ideas on how to recover these files?

What I’m trying to do