“Error Establishing a database connection” no cpanel access

I think i am fucked

My website is hosted on Google Cloud Platform and so was not running on cpanel. I hade then gotten the database error, and i cannot access wp-admin.

I have tried changing my host provider, creating snapshots and images for the other cloud provider to use and even trying to install cpanel on google cloud to then connect to wordpress domain but it is not working

Anyone can asist? Please?

The page I need help with: [log in to see the link]