Help to recover old steam account

[Kẻ Gọi Gió]

My old account was hijacked. I still have billing proof and access to old email that create the old account. However, I was unaware and create another steam account on that old email, since the old account email and phone number was changed.
How can I recover the old account to my old email address.

[Ogami]

Read carefully and follow the steps:

https://steamcommunity.com/sharedfiles/filedetails/?id=1126288560

[Nx Machina]

Be logged out of all accounts before starting the recovery process.