Act as a TikTok growth strategist with 5+ years of experience in viral content creation. Provide a step-by-step guide on how to rapidly grow a TikTok following, tailored for [BEGINNER/INTERMEDIATE/ADVANCED] creators in the [FITNESS/BEAUTY/GAMING] niche. Include specific tactics like optimal posting times (e.g., [7-9 PM EST]), trending hashtags (e.g., #[TREND_NAME]), and engagement strategies (e.g., duets with top creators). Also, highlight common mistakes to avoid, such as [OVERPOSTING/IGNORING ANALYTICS]. Use a motivational tone and actionable advice.