SEO is universal across the internet. As all search engines have to follow web standards. And all we are doing is ranking a URL, doesn't matter if its Shopify, Wix, Wordpress, Squarespace. It's all the same, no matter what anyone says.
If you fancy jumping on a call and chatting over some things, you are more than welcome.
Yeah you can drop me an email at email@example.com and we can sort things from there. :).