How can I delete uploaded files?

I need to erase my content to bring up my account.

I assume you're asking how to delete uploaded files seeing that you're way beyond your 100MB Total Upload Space limit.

You need to delete submissions to free up space. Deleting a submission will also delete the associated uploaded file in it.

IMPORTANT: When deleting submissions individually, you will see this warning message (see screenshot below). Please note that deleting submission data is irreversible and will permanently remove it in our servers, including the file uploads on them.

Complete guide: How-to-Delete-Form-Submission-Data