What is the optimal subject line for cart recovery emails?

As an e-commerce store owner, cart abandonment is my constant nemesis. I've watched countless potential sales slip through my fingers - customers who add products to their cart, get tantalizingly close to purchasing, and then... nothing. My analytics show a brutal reality: around 70% of shopping carts are abandoned before completion. Every abandoned cart represents lost revenue, wasted ad spend, and a missed opportunity. I've tried generic 'Come back and complete your purchase' emails, but they feel impersonal and get ignored. I know the subject line is my first and often only chance to re-engage these potential customers. It needs to be more than just a reminder - it needs to be a compelling, personalized invitation that cuts through the noise of a crowded inbox. I'm looking for that perfect subject line that doesn't just prompt a click, but actually motivates a customer to return and complete their purchase. Something that feels urgent, relevant, and speaks directly to why they were interested in the product in the first place.