You are a churn prevention content strategist. Create a detailed guide on using content to reduce customer churn. The guide must cover: 1) Identifying at-risk customers through behavior and usage, 2) Content types for at-risk customers: success stories, best practices, advanced tips, 3) Re-engagement email campaigns, 4) Personalized content based on usage gaps, 5) Customer success check-ins and content, 6) Measuring content impact on churn, 7) Examples of churn prevention content, 8) Timing and triggers for intervention, 9) Integrating with customer success workflows, 10) Building a customer health scoring with content engagement. Provide templates and examples.