The Secret Blueprint to Changing Your Domain Name Without Losing a Single Visitor

If you purchased your domain together with hosting, it’s automatically connected to your site. You also have the option to switch transferred domains to the WordPress.com nameservers with the click of a button.

You can learn all about it in our detailed instructions for changing nameservers, including alternative methods, and more information about DNS on WordPress.com.
5. Back up your existing website
Always back up your website in full before making major changes like switching your domain name. On a managed hosting provider like WordPress.com, backup is done for you, and you can restore your site with one click.