Moving to WP.com Hosting

Hi all, I searched as best I could and couldn’t find a useful discussion on this.

2 years ago, I bought a private domain and moved it to godaddy hosting via WP’s transfer service. My renewal at Godaddy is approaching and I’m instead interested in moving the new domain back to wordpress hosting.

How would I go about doing this? I don’t know a thing about it and no searches seem to turn up anything about moving TO wordpress, only from it.