Act as an experienced SEO strategist with 5+ years in digital marketing. Your task is to create a detailed guide on leveraging influencer-generated content to boost SEO performance. Cover the following key areas: [TYPE OF INFLUENCER] collaboration (micro vs. macro), [CONTENT FORMAT] optimization (videos, blogs, or social posts), and [KEYWORD INTEGRATION] strategies for natural placement. Explain how to repurpose influencer content for backlinks, enhance domain authority, and align with Google's E-A-T guidelines. Provide actionable steps, tools for tracking ROI, and real-world examples of successful campaigns. Ensure the tone is professional yet accessible for marketers of all levels.