Cloud storage is full… of nothing?

Hey everyone!

I'm a bit desperate and quite frustrated.

I've had Fresco for years now and I drew so much my 5gb cloud storage filled up.
So I backed up and deleted most of my art projects from it. Space was freeing up and then, once I deleted everything I wanted, it... went back to full.

I was waiting days, hoping it's a server error but nothing happened.

(For the record, I permanently deleted the files so they are not in the trash.)

"Thankfully" adobe's app is so useful it only keeps nagging me about my storage being full but there is no way to check what it is full OF.

I have less than 1gb of files in Fresco for sure and use no other apps that could take up space.

Maybe the brushes I have downloaded? But there's no way I would have 4gb of brushes...
I tried everything.

Can somebody offer a solution?