From the screenshot you share, it sounds like you are experiencing a local issue. Local issues are triggered by something on your device or your surrounding circumstances and they can be fixed by local troubleshooting. To pinpoint the cause and attempt to fix the error, let's perform further local troubleshooting steps in addition to what you've already tried. Please go through the steps below, then try to access the page in question after each step, to see if any of these resolve the problem.
If none of the troubleshooting steps solve the concern, we’ll need to access your account in order to investigate this issue. 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. Please visit https://bit.ly/3cJkx8V and log in to your account to create a support request.