How can get database without domain

Hi, i had install ajenti last year on my vps but now, my domain was expried and i can't access ajenti. I had try add ip to /etc/ajenti/config.json but when i try myip:8000, it reported "This site can’t be reached

The connection was reset.".

Now i have information of:

- IP my vps

- Database_name

- Database_username

- Database_password

How can i get this database