You’re wasting your Klaviyo investment if you only send generic marketing emails. Their system is capable of things like dynamic replenishment emails and personalized-by-product onboarding messages.
Combining email and SMS into one with system with Klaviyo will give you a clearer picture of your ROI, and save you a lot of heartache from using separate SMS systems like Attentive and Postscript.
Klaviyo knows when people buy products because of the insane amount of e-commerce purchase data stored in their system. You can put it to work with their predictive analytics capabilities, like by segmenting off of their Expected Next Order Date model.