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Onedrive storage problem


I have been getting daily emails from sharepoint online that I have reached my storage limit. So I went to check my RMIT Onedrive online and saw that I have accidently synced my MYOB Accountright 2020.3 software and its associated folders from my desktop to my Onedrive. 

I have managed to stop the syncing to my One Drive but I can't delete any of my MYOB stuff because I don't have any free storage left to delete anything.

Is there any way to ressolve my issue?