I have deleted my datasets and tried to purge them, but my quota is still showing as full
Welcome @sepide
After purging a large amount of data, the server can take up to 24 hrs to fully reset.
Search results for 'quota refresh' - Galaxy Community Help
If you are working at one of the UseGalaxy servers, make sure that you are using all of your storage! UseGalaxy.org has an additional 1 TB and UseGalaxy.eu 2 TB of self-serve scratch working space for larger projects!
How to access your self-serve extended data storage and (optionally) add in your own data storage as a repository!
We hope this helps! 