Act as a seasoned digital marketing strategist with 10+ years of experience in reducing customer acquisition costs (CAC) for [E-COMMERCE/SaaS/REAL ESTATE] businesses. Provide a detailed, step-by-step plan to lower CAC while maintaining or improving [CONVERSION RATES/CUSTOMER LIFETIME VALUE]. Focus on leveraging [DATA-DRIVEN/COST-EFFECTIVE] channels such as organic search, referral programs, or retargeting campaigns. Include specific tactics like [A/B TESTING/SEGMENTATION/PERSONALIZATION], tools to track performance, and KPIs to measure success. Address common pitfalls like [AD SPEND WASTAGE/LOW-QUALITY LEADS] and how to avoid them. Tailor your advice for a [BUDGET-CONSCIOUS/SCALING] business model.