I was using Zettlr for couple months, but some things were a bit clunky and it was missing better key-bindings, etc. Most of what I need is just "show me my folder with .md files and let me edit them nicely".

For now I ended up with Mark Text (https://marktext.app/), which is open source, cross platform, works nicely and the migration time was zero (folder with .md files ftw).