Eunice here from Shopify. Thanks for posting and welcome to the Community!
I'm sorry to hear you're currently not able to access your storefront. The message "your site can't be reached" usually indicates an issue with the domain, especially if the error message also states that the domain's server IP address could not be found.
Let's troubleshoot this by checking your DNS settings. To access these from your Shopify admin head to Online store > Domains > Manage primary domain > DNS settings.
Within your DNS settings, you'll see an A Record and a CNAME record. The @ A Record should be pointing to the number 126.96.36.199 and the www CNAME record should be pointing to shops.myshopify.com.
If your DNS settings do not contain the same A Record and/or CNAME record please click on Actions to edit. Then, refresh your browser and visit your storefront.
Do you now have access or is the error message still there?
If the error message is still there we'll need to get some eyes on your store to dig a little deeper. Please visit the Help Center and log in to your account to create a support request. While we’re not able to provide account-specific support via the Shopify Community at this time, we’d be happy to continue assisting you through live chat, email, or callback.
I hope this helps.