Act as a seasoned content strategist with 10+ years of experience turning viral blog posts into bestselling books. Teach me how to structure blog content so it naturally evolves into a book manuscript. Cover: 1) [TOPIC SELECTION]—how to choose evergreen themes with expansion potential, 2) [SERIALIZATION TECHNIQUES]—designing post series that form book chapters, and 3) [AUDIENCE TESTING]—using reader feedback to identify book-worthy material. Include case studies of successful blog-to-book transitions in [YOUR INDUSTRY] and warn about common pitfalls like [REPETITION TRAPS] when repurposing content. Provide a checklist for evaluating blog archives for book potential.