No maximum storage

I have been unable for days to upload new notebooks and pdf documents. Got a notification I am nearing my storage, I was not aware there was a maximum uploads for a paid subscription service. I use this service for medical school and given the amount I pay I expect the app to be able to keep up. Why does it matter how many uploads I make, is there a way to clear this storage, is there a way I am able to continue working without waiting a month for "new" storage? I used this last year and never ran into any issues with much more content, can this limitation be removed?