Why is my Shopify store not converting?

Conversion problems break into two buckets: a structural problem (your value proposition does not register, period) or an execution problem (the offer is fine but the page leaks visitors at a specific step). The two are addressed completely differently. Run a five-second test on five strangers before touching code: if they cannot tell you what you sell, who it is for, and why they should buy, the issue is structural, not tactical.

When the structural answer is fine, the conversion drag is almost always one of: load time, trust, or checkout. Page speed: every additional second of LCP costs about 7% of conversion (Google Web Vitals + Shopify research). Trust: the absence of recent reviews, return policy clarity, secure-checkout indicators, or visible founder identity each cost between 5% and 22% of conversion individually. Checkout: forcing account creation costs 24%; Shop Pay turned on adds about 18%.

The mobile checkout flow is where most stores quietly bleed. Sticky add-to-cart absent? Lose 5-12%. Cart drawer pops over a broken mobile keyboard? Lose another 8%. Shipping cost surprises at the final step? Cart abandonment crosses 70% (Baymard's industry-wide baseline). These compound: a store with all three problems can run 30-50% under its niche median for no reason other than mobile execution.

A non-obvious cause: app bloat. Every Shopify app injects script tags. Stores running 8+ apps frequently push LCP past 4 seconds without realising it, especially on mid-tier phones with weak cell signal. Audit your installed apps quarterly; remove every one that is not directly tied to a conversion lift you can measure.

The one diagnostic move that beats most others: install a session-replay tool (Lucky Orange or Microsoft Clarity, both free tiers exist), filter to mobile sessions that added to cart but did not check out, and watch ten of them end-to-end. Within 30 minutes you will have a list of three concrete fixes that compound to 20-40% relative CVR lift.