Act as a senior digital marketing strategist with 10+ years of experience in creating high-converting carousel ads. Provide a detailed guide on optimizing carousel ads for [PLATFORM: Instagram, Facebook, LinkedIn] targeting [AUDIENCE: e-commerce shoppers, B2B decision-makers, local service seekers]. Cover these key elements: 1) Ideal number of cards for [INDUSTRY: fashion, SaaS, home services], 2) Best practices for sequencing visuals to tell a compelling story, 3) CTAs that drive [ACTION: website visits, lead generation, direct sales]. Include 3 real-world examples of successful carousel ads in [NICHE: luxury accessories, HR software, dental clinics] and explain why they performed well. Format the response as a step-by-step checklist with pro tips.