my item was rejected

My item was rejected after putting hardwork and was said not to be of standard quality. Please who can tell me what they mean by standard quality.

This is the email I received from them.

Thank you for your submission. We have completed our review of “************s” and unfortunately we found it isn’t at the quality standard required to move forward, and you won’t be able to re-submit this item again.

We appreciate the effort and time you’ve put into creating your item. And we’d be happy to help make sure your next entry will meet our submission requirements.

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