Act as an SEO specialist tasked with auditing a medium-sized e-commerce website to identify areas for improvement in search engine visibility. Prepare a detailed report that includes an analysis of on-page and off-page SEO factors, keyword usage, site speed, and backlink profile. Recommend actionable strategies to enhance SEO, such as content updates, meta tag optimization, and link building. Present your findings in a structured report with prioritized action items and expected outcomes.