I don't know, I've also experienced something like this and couldn't get in either
Question about reopening a closed account

After you close an account, I think you need help from Support to reopen it.
Maybe they changed something again but a couple of months ago a user could just log in without contacting Support

When I try to login in my alt after self-closing the account, it says that my password is incorrect;-; even though both email and password are correct.
I also tried changing password and than logging in but it just shows incorrect password everytime, what to do?
I also can login in other sites with this password, but not in chess.com...
Just click forgot password and copy paste

Go to settings>account>connected account
And check if it's linked anywhere.
I remember linking my account to my gmail

And have you reopened the account or facing problem in that too
That's the problem bro, I'm unable to reopen

When I try to login in my alt after self-closing the account, it says that my password is incorrect;-; even though both email and password are correct.
I also tried changing password and than logging in but it just shows incorrect password everytime, what to do?
I also can login in other sites with this password, but not in chess.com...
https://support.chess.com/en/articles/10971891-how-do-i-reopen-my-closed-account
It the steps there do not work, you'll need to contact Support directly using the option in the menu.
When I try to login in my alt after self-closing the account, it says that my password is incorrect;-; even though both email and password are correct.
I also tried changing password and than logging in but it just shows incorrect password everytime, what to do?
I also can login in other sites with this password, but not in chess.com...