Run a time limited giveaway on a reader platform

List a small number of copies in a two week giveaway on a platform like Goodreads, timed to end the week before your release date, and mention the giveaway once in your newsletter and once on social with the entry link. Follow up with entrants after the giveaway ends, win or lose, with a pre-order link.

Why it works: A giveaway adds your book to reading lists and wishlists even for entrants who do not win.