Nick here from Shopify.
Instagram changed their backend recently and having Instagram feeds natively in websites/stores isn't possible, so an app is the best direction forward for you here. There are a number of Instagram feed apps in the Shopify App Store with a lot of them having free plans too! Let's take a look at some of them below:
Hopefully, you can find one you resonate with and matches up with your store!
It's really great to use UGC to grow your website. Instagram also allows you to add its feed on the website but with this, you can only add a single feed at a time.
But Shopify has many apps that allow you to add an Instagram feed to your Shopify store.
Try the "Instagram feed" that I found here at "https://apps.shopify.com/tagembed-widget". It's really fine and easy-to-use for everyone.
Hope you would get the desired solution.