That's me! I got dovecot in docker working for email archive, and moved all my old emails there. I access them through thunderbird on pc and k-9 mail on phone. Works great!
It took a bit of time to set up the passwords, and understanding the configuration. I used the lets encrypt certs from caddy.
I had to look at some different examples of the dovecot config file to get it right
I have been using Zettel notes android app and syncing the md notes on syncthing. I enjoy the experience
But I recently discovered silverbullet https://github.com/silverbulletmd/silverbullet and I think I will give it a try when I get back from holiday. I think it can be combined with syncthing too