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The Audience Revolution: The Smarter Way to Build a Business, Make a Difference, and Change the World
amazon.com
— especially for an unproven author who lacks a pre-existing audience — is
Rob Fitzpatrick • Write Useful Books: A modern approach to designing and refining recommendable nonfiction

How to Market a Book: Overperform in a Crowded Market (Reedsy Marketing Guides Book 1)
amazon.com

The Passion Economy is about quality and the conversation you have with your clients.
Adam Davidson • The Passion Economy: The New Rules for Thriving in the Twenty-First Century
Subscriptions for Authors: How to Make Consistent, Sustainable Income from Your Stories (Storytellers Rule the World Book 1)
amazon.com
Romance thirty. This is a business goal. You want to treat your thirty best customers (or whatever number you think you can manage) very well.