Become a public figure in some related field, relying on different media, then, once you are well anchored, announce that you wrote a book.
Writing may hold some kind of eternity and agelessness to it, yet it is an obsolete form of media, thus becoming some kind of master twitterer may be a way to gain immediate popularity and attention.
I am not using twitter, yet I am taking this route. I wrote only first three chapters.