Despite upgrading storage full

Hi,
I recently changed to the 2GB plan as I had an alert that I had reached my Zotero File Storage quota. As soon as I did that though, it immediately filled that and even after deleting many folders, it is still showing that it is full. Am I doing something wrong, or do I need to upgrade to 6GB. I'm a student and in my country's currency, $60 p/a is a lot!

Thanks
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