The account and password are leaked, what should I do if the hacker has logged in? How can you stop the hacker from logging in to the account? It is useless to change the password.
https://skullgirlsmobile.com/contact/ Hit them up, but if you can still log in, get in, change the email, password, basically anything it was connected to.
Also, change your passwords on everything that shared that email/password. Not trying to get you to panic, but oftentimes hackers look for a password so they can get into other things that share that password.
Also, use a password manager that isn't cloud based. I use Keepass, it's entirely local so there's minimal risk of it leaking. There's plenty of options, but avoid anything that uses the cloud, that adds another layer of risk (especially don't use in browser password managers, that's the first place a hacker will attempt)