I have been contemplating ripping the onenote notebook out of OneDrive and onto the local file system, then using syncthing to sync it between my various device

I have been contemplating ripping the onenote notebook out of OneDrive and onto the local file system, then using syncthing to sync it between my various devices. While this solution will let me get back to business with OneNote 2010, I am still only buying myself time since long-term, I want to be using FOSS software or at least an open format file format like Sqlite.