Contact your local Better Business Bureau and ask for a list of companies that people are complaining about. Then run a short ad in the local paper for two weeks, twice weekly.The ad copy might read, "Get Satisfaction On Your Warranty Or Guarantee", then print the book (let) title, your web site, and include that it's available on Amazon E-books. A local phone number could be helpful.
If you get client contact, offer to write a letter of complaint or to send a copy of your new book; even it it's via snail mail (they pay the postage). Your target market is very broad covering the widest possible spectrum. Local exposure of your work is a first stepping stone. Don't hit them too hard on a letter fee. You have to build-up your product and/or services before you can roar.
Many people on the social media sites will likely think you're spamming. Everyone's radar is up because of all the scamsters. Good luck!
I contacted my local newspaper and asked them to look at my E-book on amazon. If they liked it and wanted to talk to me about it, I would be grateful to hear from them. In todays edition of the Mooresville Times in Indiana, they featured me and my first book Everpearl. Hopefully it will lead to a spike in sales.
You can also try blogging and twitter, but it's a slow climb. I follow people on twitter every few days and usually a percentage of those will follow back. I'm up to 2000 but it's been 7 months since I first signed up.
Traci's right though. The best thing you can do is keep writing and adding to your published collection.
I did think the reference to "OP" was a bit odd. Thanks for setting it straight. If it helps any I'll repeat the advice of Don Vito Corleone. "Women and children can afford to be careless. Men cannot!"