The top half of the front page is just fine - but then you have a huge amount of whitespace followed by another set of CTA buttons below a couple links that are

The top half of the front page is just fine - but then you have a huge amount of whitespace followed by another set of CTA buttons below a couple links that aren't relevant to buying the book. I'd delete those. Also, your secondary pages have large gaps of whitespace and overly large titles. Shrink them a bit and tighten up the content on the page, and you should be in decent shape.