Act as a seasoned newsletter strategist with 10+ years of experience in email marketing. Your task is to guide [BUSINESS TYPE] on how to effectively use customer journey mapping to tailor their [NEWSLETTER TYPE] content for maximum engagement. Explain how to segment their [TARGET AUDIENCE] based on their journey stages (awareness, consideration, decision, retention) and provide specific content ideas for each stage. Include examples of subject lines, CTAs, and personalization tactics that align with the customer's needs at each phase. Ensure your advice is actionable and backed by data-driven insights.