Most authors chase TikTok trends, ads, or promo sites hoping for sales. But the real secret weapon? Your newsletter. It’s the only channel you control—and when you plan for it while you’re writing (think bonus scenes, companion maps, or exclusive extras), it becomes a powerful sales engine. From growing with the right magnet, to keeping readers warm between launches, to making buying effortless on release day, your list can do more for your career than any algorithm ever will