How can I get access to my previous iCloud if I do not remember my previous Apple ID
I do not remember my previous Apple ID and can not get access to my previous iCloud. I changed my phone number as I moved to a different country , but every time I try to retrieve my old Apple ID to get access to my old iCloud they send verification to my old telephone number that I used 10 years ago, obviously I do not have access to that number now. How can I go about it ?