Ways I can make my website more user-friendly

I have a shop on Shopify on a basic plan with a free theme. I know my website needs an up leveling and I was just wondering if perhaps you can suggest ways during the session to help us to do this. I’ve linked my Shopify store with my Pinterest business account. One week I’m a verified merchant and then the next week my verified merchant status is canceled due to an issue with Shopify. This is as per the message from Pinterest. Why am I having issues with Pinterest?