Delete Site
https://en.support.wordpress.com/delete-site/
However it may be better to keep it as private so that incase you need it at somepoint you may use it. Often if you forget to pay domain or hosting your site will be off. In such cases you may use your free wordpress site.
Deleting a site permanently removes it and you’ll never be able to re-use its WordPress.com address (such as yourgroovysite.wordpress.com).
If that’s not what you want to do, you can instead:
Change your site’s address and keep your content
Delete old posts and continue using the same address
Empty your site of all its content for a fresh start and continue using the same address
Transfer your site to someone else
Make your site private so only people you invite can see it
>>
https://en.support.wordpress.com/settings/privacy-settings/
https://en.support.wordpress.com/delete-site/
However it may be better to keep it as private so that incase you need it at somepoint you may use it. Often if you forget to pay domain or hosting your site will be off. In such cases you may use your free wordpress site.
Deleting a site permanently removes it and you’ll never be able to re-use its WordPress.com address (such as yourgroovysite.wordpress.com).
If that’s not what you want to do, you can instead:
Change your site’s address and keep your content
Delete old posts and continue using the same address
Empty your site of all its content for a fresh start and continue using the same address
Transfer your site to someone else
Make your site private so only people you invite can see it
>>
https://en.support.wordpress.com/settings/privacy-settings/