Worth doing early, and worth doing sparingly. Swaps and group promotions are the fastest way to grow a small list, and they put your book in front of readers of your genre. The catch is who they bring in: a large share of sign-ups are collecting free books, not looking for a new author. Authors who get the most from them run a few a year, match the genre closely, and judge each one by how many new subscribers open their emails a month later, not by the headline number.
From discussions on r/selfpublish in 2026, the same problems come up again and again:
Verified 1 October 2026.