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Deleting submissions that have files attached to them, should Free up more space in your account. Depending on how large the files are, they may only lower the total in your account by a small amount. Several of your forms still have a large amount of uploads:
If you delete a form, it will not lower the count until it is purged from your trash:
Rather than restoring them, purge them from your trash can and that should free up the space their submission were taking.
If you have any further questions, let us know and we will be happy to help.