My name is Lilith, I'm on the Social Care team at Shopify.
Depending on what you're attempting when on your store, the type of error message or what you see on your screen there could be some quick solutions for you and some that may require an escalation to our account team for further investigation.
Do you happen to have a screenshot of what you see when you try to load or log into your account?
Let me know how you do with the information above! I'm happy to answer any questions you think of as you work on your business.