There is plenty of advice on and off the internet about writing, publishing, and marketing your books. The question is not do I listen but how do I discern good and bad advice.
“Writing is your primary focus, so learn how to minimize your marketing and financial efforts. By so doing you can stay fresh and keep your focus on writing.”
Focus is the ability to concentrate on both the problem and the solutions. In marketing, it requires a high degree of study to determine the best course of action.