I'm a big fan of Logseq. I use Syncthing to sync a folder between my desktop and phone and it works great. Tagging, everything is in markdown, and it's easy to navigate around.
i made the same migration from markor (files in a folder) to logseq. there's a lot to be gained - always-preview alone is a game changer - but on mobile the visibility of the keyboard can be fiddly. once in a while you'll feel like you're in vi, it has such a mind of its own. but i'm not planning to go back