I moved to Microsoft OneNote. Features are ok, but now I'm a bit worried about the scalability. Putting all notes in single file does not feel the best option a

I moved to Microsoft OneNote. Features are ok, but now I'm a bit worried about the scalability. Putting all notes in single file does not feel the best option and on the other hand I dislike the idea of managing multiple notebooks (and wasting brain cycles thinking how to do the split). I don't have much special requirements, but I really want to have tool where I can easily copy-paste images (mostly screenshots), scale them and write stuff around them.