Shopify's biggest CRO opportunity right now isn't on your site. It's in your post purchase flow. Most owners obsess over the homepage and PDP. Meanwhile, the highest intent customer they'll ever have just bought something and they're getting: A generic order confirmation email. Zero upsell on the thank you page. No followup sequence beyond a shipping update. A review request 3 weeks too late. That customer just opened their wallet for you. They're warmer than any prospect will ever be. They trust you enough to give you money. And most stores treat that moment like a transaction ending instead of a relationship starting. What actually moves the needle: A real thank you page with a onetime bundle offer. Not "10% off your next order." A specific add-on to what they just bought, available right now. An email sequence that teaches them how to get the most out of the product. Use cases, tips, customer stories. By the time they're ready for product #2, you've already earned it. A review request timed to when they've actually used the product. Not day 3, day 14 or 21, depending on what you sell. A referral offer that triggers after they leave a positive review. Their best moment to refer is when they're excited about the product, not when you finally remember to ask. Acquiring a new customer is 5-7x more expensive than getting an existing one to buy again. But most Shopify owners are still pouring everything into the front of the funnel. The post purchase flow is where the real margin lives.