Yup, that's right, stop listening to all of those people who claim they have the answer for your book selling woes. The truth is, they don't know jack squat, and if something they tell you actually worked, it was a happy accident, not expertise. Yet, they are convinced that it's from their brilliant knowledge.
You need to promote your book on Twitter! Use your Facebook! Banner ads, that's the ticket! And on and on it goes. And it's annoying people, so in the words of Joey Gladstone from "Full House": Cut. It. Out.
I can hear the screams already. But if I don't market, I'll never sell any books! And if I don't sell any books, I'm a failure! Guess what? The only one keeping score is you, and the rest of us don't care because we're worried about our own score. In the end, you have to ask yourself this question: do you want to be a writer and turn out multiple works, or do you want to be a one-hit wonder and just live off your one or two books. If you answered the latter, you may as well leave now, because you'll completely disagree with me.
This advice comes from someone who has over 30 years in the industry: keep writing and publishing. I think he said it better than that, but you get the idea. When you keep writing and publishing, you add to your virtual shelf that people browse when looking for their next book. As you have more books, you take up more of the virtual shelf space, making it more likely that someone will come across one of your works and want to buy it. If they like it, they'll seek out more of your works, and hopefully tell their friends about you.
Do you need to get the word out? Sure, there are plenty of ways to do it without going to the annoying lengths of tweeting twenty times a day or other social media annoyances. Instead, figure out how to reach your target market. Those are readers. Where do readers hang out? Some go to libraries, so think about doing something with your local library. If that goes well, think about going to other libraries in your region. Where else do they go? Bookstores. Why not try to do something with your local bookstores? Also, have you considered sending out a press release to area news outlets when you release a new title? I've done it, and it does generate sales. What about local book clubs, have you considered contacting them to see if they would be interested in reading your book and discussing? The possibilities are only limited by your imagination. And best of all, these target your potential audience of readers.
Another aspect that is tied in with this your sales numbers. Will you sell a million copies of your book? Probably not, unless you get really lucky. More likely, you'll slowly grow your sales over time as you release more books. This is as it should be. So stop lamenting over your low sales numbers and keep working at it. You'll get there, it just takes time. Now get back to writing your next book!