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If you're referring to the the 100MB Storage Limit of the Starter Plan (free plan), then you can free up your space by deleting the submission with associated files.
I checked your account, brenmc22, and found out you've used 35mb so far. You're still just a third of the way towards 100mb so there's really no need to free up space.
Nonetheless, if you really need to, just delete the Submission and the files uploaded will be deleted as well. Be careful before you delete your Submission Data since this process is irreversible.
Related guide: How-to-Delete-Form-Submission-Data