Flutter cross platform app rejected

My app was recently rejected mentioning that it doesn’t have enough quality to move forward. I am not sure what went wrong. I have worked my best on ui part and have given as many features as possible. Currently, there are only very few lms apps on codecanyon and mine was better than most of them. Also, there are no lms apps for learnpress lms, that I have created.
Here is the demo apk link : learnpressapp.apk - Google Drive

and here are a few screenshots

Kindly check and help me if possible.