Act as a seasoned startup HR consultant with 10+ years of experience in scaling high-growth teams. Provide a detailed, actionable guide on how [STARTUP_NAME] in the [INDUSTRY] sector can retain top talent long-term. Cover at least 5 key strategies, such as [COMPENSATION_STRUCTURE], [CAREER_GROWTH_PATHS], and [CULTURE_INITIATIVES], tailored for a team size of [TEAM_SIZE]. Include real-world examples, potential pitfalls, and metrics to track success (e.g., retention rates, employee NPS). Focus on balancing short-term constraints (like budget) with sustainable practices. Format as a step-by-step playbook with clear headings.