Nick here from Shopify.
Sorry to hear your store is unavailable. There could be a number of reasons why this is happening and without taking a closer look, it's difficult to know why exactly this might be. We do have a Community going through some of the reasons and best next steps to take when this happens. You can see the FAQ here.
You can contact the Support team directly for more assistance via the link here. If you are unable to log in to your store, click the "Continue without logging in" option to be able to speak to an advisor.