How Do I Get My Photos Off Google for Good?
Export, fix the metadata, store them in plain folders, then delete. The middle step is the one people skip.
Export everything with Takeout, fix the dates and places so the files stand on their own, put them into year folders on a drive you own, back that up, and then delete from Google.
Skipping the middle step is what traps people. A folder of undated files is so unusable that most people give up and go back, which is not really leaving at all.
Takeout JSON Metadata Fixer is that middle step. It turns the export into a library that works in any app, with no account. It runs on your own computer and is free for your first 500 photos.