Redirect a WordPress.com blog to my own domain – or vice versa?

I have a WordPress.com account that links to a page that has nothing on it – https://danfost.wordpress.com/

When I go to comment or sign in on another blog, it has me sign in using my WordPress account, which links to this page.

I have my own domain names that use WordPress – https://www.danfost.com and https://www.giantspastandpresent.com – and I would prefer to link to those. I’d rather no one ever see https://danfost.wordpress.com/

Is there a way to make it so that, if someone does go to https://danfost.wordpress.com/, they instead will see one of my other pages? I don’t really care which one.

Thank you!