My click-through rate seems low and I’m not getting a high ROI. What can I do?

This most likely means that you’re targeting too broad an audience. Refine your targeting by adding specific authors, categories, regions, and retailers to make sure you’re reaching the most relevant audience. It could also mean that your creative isn’t engaging enough. Make sure that the text in your ad is actionable and easy to read, and consider including the cover of the book in the design.