Your question is Measure High Value Churn Reduction. Take a moment with it on the right.
Talk me through your thinking if you like. When you're confident, submit your answer and I'll grade it like a real screen (7/10 or better passes).
You've launched a feature intended to keep your most valuable users engaged over time. The team wants to judge success in a way that captures both short term behavior changes and whether those users actually stay.
How would you evaluate the success of a feature aimed at reducing churn among high-value users?