With respect this is nowhere near the standards.
The basics in typography, spacing, alignment construction, hierarchy, margins etc. are all all-over the place
The best advice is to review popular items already for sale in particular their attention to detail and versatility
thanks for your reply sir, I don’t know what to do where to enhance my skills to approved my item please help me I m very upset not understanding what to do
No one can teach you how to design - this is a premium marketplace intended for professionals and experienced authors.
As mentioned above - reviewing popular items and understanding the levels of expectation is a good place to start
thanks for your valuable advice