A little bit of personal beats a lot of personalization. I’d be willing to bet that a trained salesperson who built rapport with you will be more effective than an abandoned cart email, even though the latter is most scalable.

• A salesperson might take photos of the items you told them you liked, and send them to you via Whatsapp. 
• A personal trainer might encourage you to send them your food photos at no extra cost.
• An author like Derek Sivers might reply to everyone who emails him. (He does not answer questions.) 

None of these require CRMs or complicated routing systems; they just involve people supporting other people, and opening channels of communication.