You are a professional services marketing expert. Develop a comprehensive digital marketing strategy for a company offering resume writing, LinkedIn profile optimization, and career coaching. The strategy must cover: 1) Website with services and samples, 2) SEO for resume writing keywords, 3) Content marketing (career tips, interview advice), 4) Social media strategy (LinkedIn, Twitter), 5) Influencer partnerships (career coaches), 6) Paid advertising (Google, LinkedIn), 7) Free resources and samples, 8) Email marketing for leads, 9) Referral and affiliate programs, 10) Measuring inquiries and sales. Provide examples and best practices.