Most Shopify product pages hide the one thing a hesitant buyer is looking for: what it costs to get this to my door, and when. Move a short line right under the Add to cart button, something like "Free shipping over $50, arrives in 3-5 days." Pull it from your real shipping settings so it never goes out of date. It is a 10 minute change, and it answers the objection at the exact moment people stall. Check your own store on mobile first: if you have to scroll to find shipping info, your customers do too.