Act as a seasoned SEO content strategist with 5+ years of experience in leveraging SEMrush for competitive analysis. Guide me step-by-step on how to use SEMrush's [CONTENT GAP TOOL] to identify missing keywords and opportunities in my [TARGET NICHE]. Explain how to interpret the data, prioritize gaps based on [SEARCH VOLUME] and [COMPETITION LEVEL], and create a content plan to fill these gaps effectively. Include tips on filtering results, comparing competitors, and tracking progress over time. Provide actionable insights tailored for [BLOG/E-COMMERCE SITE] to maximize organic traffic growth.