Whether your book is published traditionally, or you’re doing it yourself, unless your name is Steven King or Margaret Atwood, you’re likely going to be doing a lot of self-promotion and marketing.

With over one million new books published each year (and that’s new books, never mind the millions already out there) you’re going to have to do something to make yourself standout. Maybe you’ll develop a huge social following. Or build your author brand. Or utilize your mad networking skills to get a bunch of Amazon reviews.

Or maybe you should redesign your book cover.

At 99designs, we believe in the power of design. And not just in the frou-frou, beautiful-things-make-us-happy kind of way. We believe that good design can help authors and entrepreneurs look more professional and make more money.

We also believe in the power of data, so we put our beliefs to the test.

Our methodology
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We recruited four authors and offered them free book cover design contests in exchange for being our guinea pigs. Our book design experts worked with authors to select the most viable cover designs.* We then created two ads for each book: same written copy, same title, same target audience, same everything, except different cover images.

We ran A/B tests to see which version of each ad got more clicks on Facebook. The results surpassed our expectations:

The new, redesigned book covers generated 51% more clicks than the originals.
Overall, every single one of the books tested performed better with a new, professionally designed cover. Improvement in click-through rate ranged from 6% on the low end, to 122% on the high end. Let’s take a look at the individual cover redesigns and see what we can learn

Click to continue reading... https://99designs.no/blog/tips/impact-book-cover-design-on-sales/

Courtesy Elev8 Design Hub...

I came across the article online and it's a really good read for authors

Won't take much time, backed up by hard facts and simple to understand

You should take a look at it

HOW COVER DESIGNS CAN INCREASE BOOK VISIBILITY BY 50% OR MORE

Peace.