1. I have seen many popular book/product sales sites and usually it is a one page site which pitches the idea and shows through testimonials what can be done. You could use a similar format for your site.
2. The copy writing on your site needs some work. It's a sales pitch so it's gotta be convincing.
3. As @djb_hackernews pointed out in his comment, ebooks usually work out for bloggers or 'celebrities' who already have a following. Perhaps you could start a blog about your ideas [since you mentioned you have worked on many other ideas before]. This way you would slowly but steadily get some regular readers. Also this would help in future ebooks you would like to sell.
4. You have displayed a couple of testimonials on your site. Maybe you could have some of your customers who have actually implemented the business to post some photos/videos talking about how your ebook helped them. This way your testimonials become engaging.
And BTW, the site definitely needs an overhaul.