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Wordpress site use on GCP--Offline or shows error establishing database connection

I have a site hosiped.com hosted on GCP Compute Engine.

I migrated the site using All in one WordPress migration plugin. 

It has been running alright but now will show either error establishing database connection or is offline.

How can I troubleshoot this.

I have removed the MX, TXT records that I had updated for creating email accounts.

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