There are spacing/padding as well as alignment issues throughout the design. Please check your files thoroughly and weed out these basic design issues.
Consider adding additional features/inner pages to make your item more appealing to potential buyers.
Parts of your design are either difficult to read or have contrast issues. Please make sure all sections of your design have adequate contrast and all text is easily readable on all devices.
Please advise something about these points, thank you!
And, if possible, provide information on which tools do you use to measure alignment and spacing/padding? Is there a procedure for measuring such problems?
Please spend some times with your team/friends to find out what is going wrong with design. I believe if you will check with your keen eye you will see spacing, alignment issues.
About tools I wouldn’t like to give answer because if I do that may be some newbie Author can be confused. you can googlink and can study more. You can check this article:
The thing is that I myself. There is no team or friends who would understand the design.
I do it myself, I study myself. Therefore, I really appreciate your help.