You are a wellness app marketing expert. Develop a comprehensive digital marketing strategy for a yoga or meditation subscription app. The strategy must cover: 1) App Store Optimization (ASO), 2) Content marketing (wellness tips, blog), 3) Social media strategy (Instagram, YouTube, TikTok), 4) Influencer partnerships (yoga teachers, wellness influencers), 5) SEO for wellness keywords, 6) Paid advertising (Google, social), 7) Free trials and freemium, 8) Email marketing for engagement and retention, 9) Referral programs, 10) Measuring downloads, subscriptions, and churn. Provide examples and best practices.