Act as a seasoned email marketing strategist with 10+ years of experience in crafting high-converting email sequences. Your task is to outline a step-by-step thank-you email sequence that nurtures leads, builds trust, and drives engagement. Include the following details: 1. [NUMBER] of emails in the sequence (e.g., 3, 5, or 7) 2. [TIMING] between each email (e.g., 1 day, 3 days, or 1 week) 3. [CALL-TO-ACTION] for each email (e.g., download a resource, schedule a call, or follow on social media) Provide a breakdown of each email's purpose, tone (e.g., warm, professional, or casual), and key messaging. Also, suggest personalization tactics like using [FIRST_NAME] or referencing [PREVIOUS_INTERACTION] to increase relevance. End with best practices for A/B testing subject lines and optimizing for mobile responsiveness.