How to transfer WP on my new hosting account?

Hi. I’ve recently transfered my website to a new hosting plan on Hostgator. Once I’ve changed the DNS and waited for 72 hours I’ve tried to access my WP platform : https://www.mysite.com/wp-admin. But it doesn’t work anymore.
I’ve opened Cpanel on Hostgator – Quickinstall- WP install. In the Application URL I’ve typed my old format: https://www.mysite.com/wp-admin but it says that this format is already there.
My question is: How can I log in to my old wp account on my new hostgator platform? Can anybody help me?