I made the jump to AFFiNe (https://affine.pro/) a few months ago and have really liked using it. I am able to self host and have found it to be a _nearly_ 1:1 replacement for Notion. Affine's database implementation isn't nearly as nice though - but they are workable and they are improving.
My biggest gripe is that the OSS project is very oriented around a hosted product rather than the self hosted - so things like AI configuration is tricky at best and ive had to manually manipulate my account in the db to remove "free" user limitations.
It is suitable for individuals, I used it for a couple years and was very happy with it. I only decided to move on because I wanted a local database that I could mine as my personal knowledge base.
My biggest gripe is that the OSS project is very oriented around a hosted product rather than the self hosted - so things like AI configuration is tricky at best and ive had to manually manipulate my account in the db to remove "free" user limitations.