Here are some options:

• crypt.ee: I tried this before, I don’t think it’s selfhostable but quite usable, and nice UI. Encryption available. Ghost folders if you want to. Multimedia available, not sure about storage
• joplin: you can use Nextcloud (or many other options like Dropbox) for sync and hence storage depends on your cloud solution. E2EE, has plugins, and simple enough to use.
• anytype.io and logseq: I’ve seen these mention in many places but I haven’t used either. But they seem to have very rich features, not sure about selfhosting though.