Rose here from Shopify. Thanks for reaching out!
I'm sorry to hear that you're having difficulty accessing your site. Have you received an email from Shopify about this? If so, I would suggest replying to that email directly for more context.
If you haven't received an email, please let me know and I can investigate this further for you.
I look forward to hearing from you.
Since you haven't received any information on your store and why you no longer have access to it, I would like to investigate this further. In order to do so, I will need to move this conversation to email.
I will be contacting you very shortly so we may take a deeper look into this.