How to transfer content from Hostgator to WordPress?

Hi all!

I have previously purchased a domain name from Go Daddy and hosted my server on Hostgator and using WordPress dashboard.

However, currently my domain name has been cancelled and I would like to transfer the content back to a domainname.wordpress.com. I have tried looking through the forum but I am still unsure how to transfer the content hosted on Hostgator server to WordPress and if it is possible?

I understand that I could get a full or partial backup from Hostgator. But which Backup destination it should be? Home Directory, FTP Server, FTP Server (Passive mode transfer), Secure copy (SCP). And from there how do I import the content into wordpress?