How do I reset security questions and set up 2FA for a compromised iCloud account?

My 17 pro was stolen days ago and my icloud has been compromised. It's now in Chinese and I have been trying to reset my security question cause I can't remember them. Also trying to set up 2fA but I need to answer my security question. Idk if I could get the icloud locked...

[Re-Titled by Moderator]

Original Title: Forgotten security questions