Check the basics first, Bud. Are your categories and keywords optimized? Is your author page optimized? Are you taking advantage of KDP promotions? Have you been utilizing book publicity channels? There are a many things that must work together to get sales moving. No silver bullet.
Thanks for all the help. I am reviewing and revising book description, author central profile and a few new thing that I have learned. You can now put a short video in author central about yourself. There are a couple of other new Amazon features for authors that I am investigating. Have also found some excellent software for cross posting with Facebook, Twitter and Linkin to Amazon Kindle books. Lots of work to do in this area, will post what happens.