Your hosting account can overuse resources if you are hosting a file repository or large collection of files.
Here are some common indicators of excessive disk space usage:
You can try to correct file usage issues by following any and all of these steps:
If you are still experiencing issues with resource usage, review your hosting for other possible causes at Common causes for resource overusage (Linux).
Note: You will want to make sure that you are correcting the underlying cause to any resource issue. Simply removing sites and/or files without correcting the underlying issue can cause the problem to recur.