How to delete or reset my iCloud without iCloud passcode

How can I delete my iCloud because I can’t use my Apple Store or backup storage without and I can’t logout without a previous phone number which I don’t remember because I deleted my old phones account and my phone so when I try to reset it I can’t click on forgot my password because I don’t have the phone number cause to try anything even resetting and that don’t work either because I don’t known my iCloud password.