Confused about what's taking up space in my 2 GB account

Thanks again for your additional advice. That pointed me in the right direction.

I didn't have any selective un/sync files, but I decided to look inside the folders on the Dropbox website that were marked (Symlink Backup Copy). I don't have these on disk here. To my surprise, these were not just straight copies of my usual regular in-use folders/files, but had additional files and folders inside that I must have symlinked before that support ended in 2019. One of those (Symlink Backup Copy) folders was 1 GB itself. So I deleted, then permanently deleted, those (Symlink Backup Copy) folders after downloading them as ZIPs to be safe. So, thanks to your suggestion, my account now shows as 241.77 MB (or 11.8%) of 2 Gb used.

One final point, though, the pop-up confirm window that shows with the Permanently Delete button says something to the effect that permanently deleting files does not free up space. But it actually did in my case. (?)

So, if anyone else has diminishing space issues that they don't understand and if they were using Dropbox prior to 2019, check on the website for dormant (Symlink Backup Copy) folders that might be filled with some old unneeded content.

And with this I'll consider my issue resolved. Thanks again Rich and Walter!