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I have been using QOwnNotes for about 6 months. It is cross platform, lightweight, extensible and a plain-text markdown note-taking program written in C++/Qt. It can integrate with Nextcloud. Installable via scoop on Window and apt on Debian† (after installing their apt key).
Author is quite responsive on GH issues.
† Also most major Unixes
I use Joplin synced over Nextcloud.
Standard Notes is pretty good too
I personally use Markor on Android and (neo)vim on Linux. I sync the note files using rsync (but syncthing is totally viable also).
It's probably not the solution you want but thought I'd mention it for others interested.
Turtl
I came here to recommend Simplenote. Sorry it's not working for you anymore. I've loved it for years.
Oh, I know! Start carrying a pen and a tiny notepad. It's not multi-platform, but it will rarely undelete. /s
Depends on what method h use for note taking.
If it's not that professionally or for research purposes used then simple note is great.
If it's about research data then obsidian.
Also u will obviously find it difficult to find a good FOSS app for note taking that many of them won't support sync and collaboration.
Emacs + org-mode + maybe org-roam
Amazing features, can export to a bunch of common formats.
Affine.pro has potential but a couple months from cloud.
SiYuan is solid and FOSS (GPL)
I looked into it once but there wasn't anything. I just stuck with Google Keep and it works great for small notes.