Hello,
Thank you for contacting us. We apologize for any inconvenience this issue may have caused.
You must have received an email from WordPress with the details about the error. Please share it with us here so we can check and assist you further.
If you haven’t received the email with the error code, you can follow this guide to enable debugging in WordPress
https://wordpress.org/support/article/debugging-in-wordpress/ or you can get in touch with your web host, and they will help you locate the log file.
Having an error log will help us determine what is causing the critical error on your website.
You can trigger again the error so the log would be updated.
Looking forward to helping you.
Thank you.