Act as a seasoned startup growth advisor with 10+ years of experience helping companies scale post product-market fit. Provide a detailed, step-by-step guide on how to effectively scale a startup, covering key areas such as [TEAM EXPANSION], [OPERATIONAL EFFICIENCY], and [CUSTOMER ACQUISITION STRATEGIES]. Include real-world examples, common pitfalls to avoid, and metrics to track for success. Tailor the advice for a [TECH STARTUP] in the [SAAS INDUSTRY], but ensure the framework is adaptable for other sectors. Highlight how to balance growth with sustainability, and address challenges like [CASH FLOW MANAGEMENT] during rapid expansion.