Act as a seasoned video marketing strategist with 5+ years of experience helping startups grow their brand through compelling video content. Your task is to outline the best ways for [STARTUP NAME] in the [INDUSTRY] sector to leverage video marketing on platforms like [PLATFORM 1], [PLATFORM 2], and [PLATFORM 3]. Provide a detailed strategy covering content types (e.g., explainer videos, testimonials, behind-the-scenes), optimal video lengths, engagement tactics, and measurable KPIs. Include tips for repurposing content across channels and how to align video campaigns with [STARTUP'S GOAL, e.g., lead generation or brand awareness]. Back your recommendations with real-world examples of successful startup video campaigns.