My other account got Banned. There is even no single reason stated for the ban. How can I access the account again? If I try to log in, it just says "Account Ban (Abuse)".
You can appeal an account closure by opening a ticket with support.
https://support.chess.com/article/346-contact-us
Depending on the actual reason, they may not allow it to open. Also, the site only allows one account per member:
https://support.chess.com/article/596-can-i-have-multiple-accounts
My other account got Banned. There is even no single reason stated for the ban. How can I access the account again? If I try to log in, it just says "Account Ban (Abuse)".