How can ecommerce stores get more value from Klaviyo?

I have been looking into email marketing for ecommerce, and it seems like many stores use Klaviyo but do not always get the full value from it. They may send regular campaigns, but the automation, segmentation, and customer journey are not always set up properly.
For an online store, what do you think matters most in Klaviyo: welcome flows, abandoned cart emails, post-purchase sequences, winback campaigns, customer segmentation, A/B testing, or deliverability?
I feel like Klaviyo works best when it is treated as a full retention system, not just a newsletter tool. A good setup can help bring customers back, recover lost carts, and improve repeat sales without relying only on paid ads.
I found this klaviyo agency while researching ecommerce email marketing, but I would like to hear from others too. What Klaviyo strategy has worked best for your store or client? xx

I?d agree that a lot of stores leave money on the table with Klaviyo. If I had to prioritize, I?d put abandoned cart and post-purchase flows at the top first. Those are usually the quickest wins because they target customers who already showed strong intent.

That said, the biggest improvements I?ve seen come from better segmentation. Sending the right message to the right customer segment often outperforms simply increasing the number of campaigns. Once you know who your repeat buyers, one-time customers, and high-value customers are, your flows become much more effective.

I also think many ecommerce teams underestimate the operational side of retention. It helps when marketing data and customer interactions are connected to the rest of the business. For example, some teams choose to integrate microsoft teams into their workflow using https://latenode.com/integrations/microsoft-teams so campaign performance, customer events, and internal notifications are easier to track across departments.

For most stores, though, I'd rank the priorities as: abandoned cart → post-purchase → segmentation → welcome series → winback campaigns → A/B testing. Deliverability is critical too, but it's more of a foundation that everything else depends on.