It's a common complaint I hear from authors all the time. "my book is not selling but it's a great book."
I have to ask what are you doing to help sell your book? Are you just sitting there and hoping someone will stumble upon your listing on Amazon and find your book interesting enough to purchase? That is not how it works. I've said this a million times.
After you publish the hard work begins. I don't care if you are traditionally published or and Independent author you still have to put in...