You can contact and checking with your hosting provider if they are suspending your site, It only takes some minute if they do manually unsuspended your account or the second thing is to check your public_html in your file manager and see it you are having a wrong cgi script there.
Other than that, open your site a new window if still it shows suspendedpage.cgi then just press ctrl+F5 key for hard refresh or clear your browser cache or dns cache on your PC as @StrangeDays mentioned
Clear your browser cache (for Windows)
Clear your DNS cache (for Windows)
Enter cmd in the Start menu search text box.
Right-click Command Prompt and select Run as Administrator.
Run the following command:
Most possible case ,You have been suspended by your webhost. First you check whether you can login to capanel/whm, if you can't contact to your webhosting provider. They may have suspend you for policy violation , non payment etc.
If you can login to cpanel , check for any cgi-script in public_html folder, show hidden files also, delete that.
Also don't forgot to clear browser cache & DNS cache.
First you can contact your hosting provider regarding this. If you are server admin then check, List suspended accounts option in WHM and you will get reason of account suspension. Try to resolve this after that.
also you can check the suspension page in WHM.
If you are being redirected to cgi-sys/suspendedpage.cgi when visiting your website, it means that your website has been suspended by your hosting provider for some reason. There could be several reasons for this, including:
Your website may have been suspended by the host due to overusage of resources, such as memory, CPU, or disk space. It may also have been suspended due to security threats, like being hacked or infected with malware, in order to protect the server and other websites hosted on the same server. Lastly, your website may have been suspended because of payment issues, like an overdue account or exceeding the usage limits of your hosting plan.
To resolve this issue, you should first contact your hosting provider to find out the exact reason for the suspension. They will likely provide you with instructions on how to resolve the issue, such as updating your payment information or reducing the resource usage of your website.
If you find that your website has been suspended due to security threats, it is important to clean your website and remove any malicious code. You may need to seek the assistance of a professional to do this.
It is also recommended to backup your website data regularly, so that you can quickly restore your website in the event of any issues.