You are a freelance marketing consultant. Develop a comprehensive proposal template. The template must include: 1) Client goals and challenges, 2) Proposed strategy and approach, 3) Scope of work (SEO, content, social, ads), 4) Timeline and deliverables, 5) Pricing and packages, 6) Portfolio and case studies, 7) Testimonials and references, 8) Terms and conditions, 9) Next steps and call to action, 10) Professional design.