Someone puts a pair of walking boots in the basket at lunchtime, gets as far as the postcode field, and the phone rings. The boots sit there. Shopify or WooCommerce knows the email address because she typed it before she stopped.
About seven in ten online baskets end this way. Most of those people were not against buying. They were interrupted.
The first email goes out about an hour later. Short, from your name, written the way you write. It names the boots, shows the photo, and asks if there was a problem with the checkout. No discount in the first email. People who were going to buy anyway should not be taught to wait for a code.
If nothing happens, a second email goes the next morning. Still plain. If you want to offer free delivery or a small code at this point, that is your call, and it is set once.
The other half is win-back. Anyone who bought from you and has not been back in, say, 90 days gets one email that mentions what they bought last time and what has come in since that goes with it. Bought a tent in May, here are the camping chairs that arrived in August. The gap and the wording are yours to set.
The emails go through Klaviyo or Mailchimp if you already use one, or straight from your Gmail or Outlook if you do not. Every send and every return visit is logged in a Google Sheet, so at the end of the month you can see how many baskets were recovered and how much they came to. The sheet lists the actual order numbers. Anyone who unsubscribes or buys is dropped from the sequence the same minute.
This is the kind of thing we build. It runs in your own accounts. How many baskets were left behind in your shop last week, and did anyone write to them?