How do I handle cart persistence across devices?

As a Shopify store owner, I've been wrestling with a frustrating problem that's killing my conversion rates. Customers start shopping on their mobile during lunch, then want to complete the purchase on their laptop at home—but somehow, their cart vanishes. It's like their shopping journey gets completely reset. I'm seeing abandoned carts spike because customers get annoyed re-adding products or simply lose motivation. This isn't just an inconvenience; it's directly impacting my revenue. My tech team has tried various solutions, but nothing seems seamless. I need a way to make the shopping experience feel continuous and smooth, regardless of device. The modern shopper jumps between phone, tablet, and computer constantly, and my store needs to keep up. Every lost cart represents not just a missed sale, but potential customer frustration that could prevent future purchases. I want a solution that feels invisible to the customer—they shouldn't even notice they've switched devices, the cart should just... work.