got ERR_NAME_NOT_RESOLVED error for my website

The Big Ash asked:

well I didn’t do anything I mean any changes to my website. yesterday when I try to open my website which is I got This site can’t be reached’s server IP address could not be found. ERR_NAME_NOT_RESOLVED.
I have no idea what to look and what to do. I just check my public directory and everything is fine but I keep getting this page. any ideas?

My answer:

The domain expired on the 8th September 2019. You need to renew the domain with the domain registrar, ccTLD Registry of Iran. To prevent the problem in future, you should renew the domain before the expiry date.

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