Please help

Dear awesome Authors,
I uploaded a full-stack MERN app on Codecanyon for $39 I got a rejection with this email:-

This item has a nice concept but doesn’t feature the required functionality and features to be approved as a premium item. Consider expanding the feature set here.

My project demo URL:
Demo mobile: +91 9999999999
Demo OTP: 123456

Tech stack:
NodeJS with ExpressJS

I am writing here just to get some suggestions from you on what kind of features or changes I should make in order to get approval from Codecanyon Team, I am looking forward to your guidance. :’)

Thanks in advance