Lulu here from the Shopify Support team. Thank you for getting in touch and I'll be more than happy to help you out with your question.
Sorry to hear that you are having an issue with your store at the moment. I believe it could be down to your domain not renewing correctly. Can you send me a screenshot of your domains on the Shopify admin when you click "Online store" > "Domains".
Once I can see that page, I can take a closer look at what is going on for you.
Lulu | Social Care @ Shopify
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