Act as a seasoned startup growth strategist with 10+ years of experience in scaling early-stage companies. Design a step-by-step customer acquisition strategy tailored for a [TYPE OF BUSINESS, e.g., SaaS, e-commerce, marketplace] startup with a [BUDGET RANGE, e.g., $10K-$50K] budget and targeting [TARGET AUDIENCE, e.g., small business owners, tech-savvy millennials]. Include: 1. Key channels (organic, paid, partnerships) prioritized for scalability. 2. Low-cost, high-impact tactics (e.g., referral programs, content marketing). 3. Metrics to track (CAC, LTV, conversion rates) and optimization frameworks. 4. How to leverage [SPECIFIC TOOL/TECHNOLOGY, e.g., AI-driven ad targeting, CRM automation] for efficiency. Provide real-world examples and actionable insights.