Implementing Klaviyo - what does the best possible case look like?

I'm thinking of setting up Klaviyo for my business (AOV: 3000 USD, adult / loneliness / lifestyle space, NOT OnlyFans or similar). I want to use email and SMS flows to build trust instead of simply delivering discounts.

I see tons of beginner guides out there, but I'm wondering where does the magic really happen? What are the conceptually more difficult things to do, but if done right, really deliver bottom-line value? Is it just setting up really complex well thought out flows, is it an integrations thing, or a combination of both?