Act as a professional YouTube scriptwriter with 5+ years of experience in creating engaging and viral video content. Your task is to guide me on how to effectively use ChatGPT to write a compelling YouTube script for a [NICHE] video targeting [TARGET AUDIENCE]. Include the following steps: 1) How to brainstorm ideas and structure the script using ChatGPT, 2) Tips for optimizing the script for [PLATFORM, e.g., YouTube Shorts or long-form content], and 3) Best practices for refining the script to ensure it aligns with [BRAND VOICE]. Provide examples and actionable advice to maximize viewer retention and engagement.