This case study explored how Buyn.se, an online retailer of smartphones, computers, and refurbished technology products, significantly improved sales efficiency through funnel-based Meta advertising strategies. The business faced challenges including high acquisition costs, low retention, and limited customer loyalty in a highly competitive technology market. To address this, the campaigns focused on structured sales funnels, retention and remarketing flows, and positioning refurbished products as sustainable, reliable, and budget-friendly alternatives to new devices. Cross-selling complementary products and emphasizing sustainability messaging helped strengthen brand positioning while improving conversion rates. Over three months, the campaigns achieved a ROAS increase of over 22,500%, re

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