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I took a look at your account and I see that you have a storage space usage of 608.21 MB while on free plan the limit is up to 100MB.
To resolve this you can simply remove the submissions with the file uploads that take your storage and as soon as you go under the 100MB limit, your account should be re-activated.
Do of course let us know if you have any further questions or if you happen to experience any issues after or during removal of your extra submitted files and we would be happy to assist with the same.