Quillpad
''Notesnook''; crypt, open-source and sync to is own cloud. (can also disable if you don't want)
Both desktop and android app available (and sync)
Can make ''monographs'' (send a crypt note to someone, using link. Auto destroy options)
Free (pay option not necessary). No adds, no trackers and don't ask for personal informations
Differents security level (lock automatically when close or not, fingerprint, two factor authentication,)
Backups available
Can make files, tags, favorites
Almost a dream!
As far as I can tell neither of these support editing local files
Obsidian
And as far as I can tell it's not open source, so I'd rather not use it
I'm currently still on Simple Notes as it's the best option for me I think.