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I did check your account and found that it is over quota because you have exceeded the allowed upload storage space. In free account, you can only receive upto 100 MB of upload but you seems to have received 100.64MB. That is the reason why all your forms are disabled.
I have gone ahead and activated your account. I would suggest you to delete some more submissions which has uploaded files. Deleting a submission record will also delete the attached file as well. Please ensure that you your upload storage space utilization is below 100 MB.