In the high-stakes journey from startup to unicorn, navigating the Growth and Scaling phase (Series A/B) comes with its share of challenges. One of the most pressing issues during this phase is the spike in customer acquisition costs (CAC). As startups expand their reach and intensify marketing efforts, the cost of acquiring new customers can skyrocket, threatening financial sustainability. This article explores the causes of CAC spikes, strategies to manage and lower these costs, and ways to optimize customer acquisition efforts to ensure sustainable growth.