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Nowadays, to be honest, it is easier to promote your products on social media, if you create unique content, which makes you different from others. So, start promoting your book on social media by telling information about it (by the way, the book also needs to be a good one). Plus, as every author has, you need to have your site. As I noticed, every author's sites are boring, so try to make a creative one. Here https://sitebuilder.reviews/web-design/how-to-design-ux-optimized-buttons/ you can find some features for your site which will help you to achieve your goal. I really hope that I helped you.