Squarespace Design to Shopify platform

MISSIO is a hair product company that exists to inspire and empower a movement of people in the fight against human trafficking. Our brand is very narrative driven and the aesthetics are on point with the original project (our designer was the most familiar with Squarespace). Unfortunately, Squarespace is not cutting it for us as an ecommerce platform. We have already switched the checkout over to Shopify, but it is clear we need the whole thing moved over, especially before we emerge out of our soft launch as we release more products. My goal is to make the full switch over to Shopify while maintaining as much of the aesthetic as possible, especially on the Home page, the About page, and the Blog. Of course, I am open to improvements to move toward being a stronger ecommerce platform. I am also open to purchasing and utilizing an existing Shopify theme to expedite the process. I have a few themes that I have identified and like, but I am open to suggestions on how to make the switch as simple and functional as possible. Our site is www.missiohair.com. Thanks!