Please Help me my plugin got rejected and I cannot resubmit it It does't find quality

Thank you for your submission. We have completed our review of “Simple Gallery” 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. is my demo link with username and passowrd)
username: (removed)
password: (removed)
In this you find gallery images post type you can add post and for frontend you will get dynamic shorcode
Thank you

I think it’s a little bit too simple.

okk so then what can i do

Improve the design and features.

okk thank you

Just check the current/available items on the marketplace and compare it with yours. You need to add more features or better design to get the approval, otherwise, you may not get an approval. Good luck!

PS: Remove the admin login details from the public view.

Thank you