When I wrote Fueling the Night Shift, I intentionally hyper-targeted only nurses working 12-hour night shifts. The upside: The audience feels instantly seen, reviews are heartfelt, and the book solves a very specific problem. The downside: The total pool of potential readers is small. It’s a tradeoff between strong resonance vs total market size. Curious what others think: Where do you draw the line? How do you decide when a niche becomes too tiny to sustain consistent KDP sales? This is the micro-niche book I built to test this idea: https://www.amazon.com/dp/B0HC52ZHYT