Generate a full detail guide on advanced customer retention strategies. The guide should be data-driven and practical. It must include sections on: 1. How to Calculate and Analyze Your Customer Churn Rate. 2. Developing a Customer Loyalty Program That Works. 3. Strategies for Proactive Customer Outreach and Feedback Collection. 4. How to Personalize the Customer Experience to Increase Stickiness. 5. A checklist for creating a seamless customer off-boarding process for those who do leave. Please include a supportive disclaimer.