The Bottom Line has a good overview of how small presses are experimenting with subscription strategies, which mostly consist of sending books out on a regular cadence to paid members.

Here’s an idea: what if a publisher leveraged a newsletter platform like Substack or Beehiiv to serialize books on a subscription basis? Basically, you pay something like $50 a year and you have a new chapter landing in your inbox every Friday. The newsletter would also function as another marketing vehicle for the print or ebook version of the book, since many people will just want to purchase the entire thing so they could read ahead. You could also run free excerpts of early chapters to get people to initially sign up for the newsletter.