Forgot recovery number

Been trying to recover appleid account as it is binding up my Mac mini from being able to use it. I’ve gotten into the gmail account associated with the Apple ID but I do not have he same phone number associated with the account for recovery ,. I’ve tried now a few times but the account is locked. Forgot password option only gives the option to enter the phone number I no longer have.

i have access to the same Wi-Fi , my credit card info and iPad. I also had paid for a 50gig iCloud storage

i need help I’m stumped