That said, as a long-term evernote user, I've been wanting to leave for a while and move to an OSS/self-hosted solution. It might be joplin but my few attempts to use it I haven't yet had enough time to evaluate whether it would be a viable long-term solution.
Edit: I'm also seriously considering just using https://github.com/Alok/notational-fzf-vim and only doing note-taking on my laptop (not on mobile). It's extremely fast and basically zero friction. This would have a slight downside in that I quite often want to consume notes on the go so I may need to find an option there (eg serve my notes up using a private server or something).