Book marketing efforts can be started at any phase of your book publishing process. However, professionals believe that pre-launch marketing brings exciting results. It is best to start promoting your book at least a few months before it comes out.
Coming to the second part of the question, the results depend on various other factors. These factors include book quality, storyline, interesting characters, or the author's credibility.
If everything is up to the mark, book marketing is like a cherry on top. At Ghostwriting Founder, we encourage clients to invest at least 4-5 months in marketing campaigns to start expecting the results. With consistent work, interesting material, and up-to-date marketing strategies, readers will gradually be pulled in to buy your book.