Need Help with Social Media Banners

Hello Authors,
This is the comment i got from envato for the banners. Please help me with this and put your own thoughts about what may be the reason…

Here is the comment from your Envato Quality team reviewer:

Unfortunately your submission doesn’t meet our current minimum technical quality requirements for the category it was submitted to. Please consider taking some time to familiarize yourself with our current library and quality levels of popular items before resubmitting.

We appreciate your submission and look forward to seeing your future submissions.