There are numerous reasons why your book is not earning $$. For initial review of your book, do contact me through Fiverr inbox, whereas if you would like an in-depth analysis do check my premium package.
FYI, if you are looking for quick results, big promises and overselling then this service is not for you.
In short, depending on the chosen package, I will provide you with the following:
Keywords research Research for optimal keywords and provide low/middle/top hits, 10 results to choose from $100
Keywords + Category research Basic package + category research, 20 results, 4 categories to choose from $140
A.I.O. Standard package + title, subtitle, interior and cover analysis, suggestions and recommendations $170
Mention https://grameenee.com when calling seller to get a good deal