How to link/merge/redirect two accounts of mine?

Hi,

I have a wordpress account where I was building my page before buying a domain, I’m a begginer and I wanted time to practice before start paying. Now i’ve already bought my domain and hosting (with Hostgator in case that information helps), and I didn’t know how to link my new domain to the web I have been building in wordpress. In the end I followed some tutorials but I ended up installing wordpress again through Hostgator’s C-panel, and now I have two different accounts, the new one linked to my domain (https://rodriguezgallery.com/), and the old one (https://localhost:8080/wordpress/) with the web I want to link to that domain.

What can I do?

Thanks