Uploaded 2 Design and both are Rejected

I have Uploaded 2 Designs and both are rejected.
Kindly anyone helps me to know what the reason for rejection, so I can improve on my design and in technical details.

Please reply with the solution.

Deepak Kumar

Fb cover feels a bit outdated, typography needs work, and it should consider the mobile .v. Desktop cropping and difference from Facebook now.

The other two images both need work with fundamental margins, padding and typography

Also on their own they won’t be enough - there are thousands of similar designs available for free online and almost every banner/Social post design submitted now comes with multiple variations or as a pack