Even though an ebook has “book” in it’s name, the “e” is the most important feature when it comes to formatting.
Because your writing is electronic, it must be scannable. Subheaders, bolding, lists, and whitespace are just as important for ebooks as they are for blogs.
In fact, since ebooks are long, your readers are especially likely to get tired of reading and need help from good formatting.
As I said, don’t forget the “e” in “ebook”. While an ebook is a long piece of content, you need to focus on its small components.
Think about your ebook as a collection of snacks rather than a meal that must be eaten in one go. Those snacks must all relate to your thesis, but they come in enjoyable bite-sized chunks like lists and short paragraphs.