Aegis seems like a pretty good 2FA app on Android from what I’ve heard. Personally, I use Ente Auth as sync is very helpful when I don’t have my phone nearby (you can either use the desktop app or use your browser, both work). Don’t think you can self-host sync, though I might be wrong. Ente Auth also works without sync, so there’s that.

I would not suggest using a password manager’s 2FA integration (e.g. Bitwarden, I think Proton Pass has one if you use that?) as it kind of defeats the point of 2FA, since if someone got access to your password manager, they would also get the 2FA codes.

I have Joplin with Nextcloud sync. It works fine for me! It’s got a desktop app and a mobile app with, in my opinion, pretty good UI. Markdown support, syncing between devices, etc. are all there. You don’t need to connect to the network to view notes, a local copy is saved.

You could always group your feeds. I have mine grouped based on topic (news, science, technology, etc.) but I guess you could always group them based on political spectrum.