acquisition activation retention referral on blue

acquisition activation retention referral marketing sales customer funnel journey lead generation user conversion rate churn loyalty engagement viral word- -mouth influencer social media email affiliate search engine optimization seo pay-per-click ppc advertising cost cpa click cpc cpl lifetime value cltv repeat purchase upsell cross-sell incentives rewards gamification personalization segmentation a/b testing analytics data analysis feedback net promoter score nps satisfaction support continuous improvement