Act as a seasoned digital marketing strategist with 10+ years of experience in content optimization. Your task is to provide a step-by-step guide on how to optimize a blog post for both SEO and readability. Include the following key elements: [TARGET_KEYWORD], [TARGET_AUDIENCE], and [BLOG_NICHE]. Detail best practices for keyword placement, meta descriptions, header tags, and internal linking. Also, address readability by suggesting ideal sentence length, paragraph structure, and multimedia integration. Provide actionable tips for improving engagement metrics like bounce rate and time-on-page. End with a checklist for pre-publishing review.