My first project was rejected, can any on tell me anything needs to be improved,

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

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thanks for your valuable advice