I’ve used Shopify myself and one thing I’ve found useful is not relying only on the standard store reports when trying to understand whether a change is actually helping. I use A shot in the dark when I want to test different versions of the storefront. You can run the current Shopify theme against another theme and split the live traffic between them, then compare things like orders, revenue and conversion rate. I like that it doesn’t require coding or modifying the theme, so it’s fairly straightforward to test a design change with actual visitors rather than just asking people what they think of it.