Welcome, @David_Morse
You can double check what the default quota allocation is for your account under the User → Preferences → Storage Dashboard view.
You may also find that you have multiple histories, and that is contributing to the total quota usage. You can clean up files to make room for more analysis. Some servers host more storage than others, and there different types of storage. More details are here for the UseGalaxy servers. → What should I do if my data exceeds the given 250GB of storage?
If that is not enough, I’m wondering which server are you working at? Find the URL at the very top of your browser window. You can paste that back here and we can help to find the details for the server you are working at.
Thanks and please let us know if you find what you need or not. 