Hi All, Is there any workaround to redirect other domain when the site is down because of too many requests?

Not ideal, but you could set the website to "offline for maintenance" and create a custom site maintenance page.

Thanks @Flo. In this case we need to set manually. Is there any automation process to redirect to other godaddy domain redirect based on the status codes ?

not that I am aware

If I have understood correctly you want the ability to redirect traffic to another website eg xyz.com if your SCA site abc.com is down. Then one approach would be to have a load balancer in front of your SCA site. You would configure that with a single destination node (ie your NS SCA Site) and then simply have a site monitor script (either part of the load-balancer or some or 3rd party tool). When it detects the site is offline (eg can't load a specific piece of content) the script would update the load balancer to redirect all requests from abc.com to xyz.com