Hey HN,<p>A preview version of my new book Lizard Optimization is now live on LeanPub. It's about 90% done - the final text is there, but some illustrations are still drafts.<p>A product I worked on grew explosively from November 2021 to November 2022. The key user metric, tracking when people are getting value from the product, increased by more than 500 times in those 12 months (times, not percent). This happened after a period of unremarkable growth and a slow decline. Looking back, the key factor in reversing the decline and unlocking exponential growth was a counter-intuitive approach to engaging users.<p>This book is a summary of what I learned from that crazy growth phase, synthesized into a simple process that you can apply to improve your products, unlock growth, reduce churn and increase revenue.<p>This book is primarily for software product managers, product data scientists, senior engineers and anyone else involved in product management and guidance.