My customers often don't log in. How can I capture their emails earlier to even be able to send them recovery emails?

I've been running my Shopify store for two years now, and one persistent challenge has been email capture. Most visitors breeze through my site, browse products, maybe even add something to cart, but then vanish without a trace. No login, no email, nothing. This means when they abandon their cart or don't complete a purchase, I have zero way to re-engage them. I'm essentially watching potential revenue walk out the digital door. My current pop-ups feel aggressive and spammy, and they're probably scaring more customers away than converting them. I know email is critical - it's basically free marketing and a lifeline for cart recovery - but my current strategies are failing. I need a smarter approach that feels natural, provides genuine value to the customer, and doesn't make them feel like they're being strong-armed into giving up their contact information. The frustration is real: I'm spending good money on ads to drive traffic, but without a way to reconnect with hesitant shoppers, I'm burning through my marketing budget with little to show for it.