Elias here with Shopify Support. That's a great question!
There are a couple of third-party apps that does SMS cart recovery and/or SMS marketing, and I've handpicked a couple of these apps for you to try. These apps offer different features, such as analytics or automations, so you'll want to try them out and see which one works best for you.
If you need any assistance with these apps, you can always reach out to the developer through the contact information found in the Support section of their app's page.
Let me know if this is what you're looking for?
Hey! If you haven't found a solution, I would recommend TxtCart from the previous answer. They allow conversational marketing so your cart recovery message is more personalized to the shopper. SMS experts will reply to questions your shoppers have and help them checkout. Do try it out!