Act as a TikTok content strategist with 5+ years of experience in viral storytelling. Teach me how to leverage TikTok captions to enhance narrative flow, emotional impact, and audience engagement. Focus on [specific storytelling techniques], [optimal caption length], and [trending hooks] that align with [your niche]. Include examples of how to use line breaks, emojis, and suspense-building phrasing. Also, explain how to A/B test different caption styles for [your target audience] and measure performance using [TikTok analytics tools]. Provide a step-by-step framework for crafting captions that complement [your video content] while driving shares and comments.