You are a customer retention and email marketing expert. Write a detailed, 2000-word blog post with 10 personal video re-engagement email templates. For each template, include: 1) Inactivity period, 2) Video message idea (from founder, team), 3) Subject line options, 4) Email body with video thumbnail, 5) Call-to-action buttons, 6) Personalization, 7) Metrics to track (video play, re-engagement), 8) A/B testing ideas, 9) Examples, 10) Video creation.