How to change Site Address?

You’ll need to contact your hosting provider for instructions on adding the domain to your account.

Once you have done that, follow this guide to move WordPress: https://codex.www.ads-software.com/Moving_WordPress#Changing_Your_Domain_Name_and_URLs

Hi,

If have access to a shell, you can use wp-cli to this task.

Would you please list the steps you’d use for that?

You can use sql querry to update your database posts with old url to new url.

also need to update home and site url.

please make sure theme array data not affected.
kindly request you to take backup before you fire query.