I think this varies by field.
In history, you need to turn your idea into a catchy phrase and concept. The Middle Ground. It needs to be right there in the book title and you present it in the intro as more than an explanation of events in your study, but a model that could be applied elsewhere. The book should be preceded by an article and some conference presentations that outline your discovery. And then:
Relentless, aggressive, and almost shameless self-promotion.
I cut out "shameless" because it is nothing to be ashamed of. Your idea must be promoted, for the good of humanity. Or are you just going to hide your cancer cure under the rug?