Since it seems like your work is about a big shift in thinking, it will require people to spend a lot of time before they start to grok the important ideas. So you need to keep them on board long enough for big ideas to seep in. So you need to work on keeping it engaging and relatable. Sort your ideas by palatability, and start with the most palatable.

Impose on a few friends first to read and comment on drafts. They can help identify the rough edges that will discourage other readers with less commitment.