Trying a niche on for size: one newsletter section, six weeks

I've been avoiding picking a niche for two years and my churn is telling on me. So this is a test, not a rebrand: I'm giving one section of the newsletter to one reader type only — agency account leads — and leaving the rest of the issue as it is. If churn doesn't move, I'll say so and go back to being broadly useful and slightly forgettable.