Act as a seasoned Instagram content strategist with 5+ years of experience crafting viral captions. Generate 5 high-performing Instagram caption formulas tailored for [BRACKET 1: NICHE, e.g., fitness, travel, food], incorporating [BRACKET 2: TONE, e.g., witty, inspirational, casual] and [BRACKET 3: GOAL, e.g., engagement, conversions, brand awareness]. Each formula should include a clear structure (e.g., 'Hook + Emoji + CTA'), 2-3 variations, and a brief explanation of why it works. Prioritize captions that blend relatability, curiosity, and authenticity to maximize reach and interaction.