My first PHP Laravel EPOS item has been rejected,please help me to make it better

Envato Quality team said,We have completed our review of “EPos - Inventory Management System” 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.

it’s working fine but i can’t understand what’s wrong with the script ? Can anybody help me what i should do now and
can i re-submit it after improvement ?

Demo Link and Documention Link Goes To Here:

Documentation :

User Name: admin
Password: 12345678