How I Helped Grow Diary of a CEO to 14M Subscribers

19 Mar 2026 · 91 min
1:30:38

Grace Miller, Head of Failure and Experimentation at Flight Story, explains how Diary of a CEO grew from 100,000 to 14 million YouTube subscribers in four years through systematic testing. They ran experiments on everything from Shorts placement to thumbnails to dubbing, and learned that doubling daily Clips output actually failed. The key was treating experimentation as a core business function, not an afterthought.

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