Without access of two devices iPhone / iPad and you don't remember the email address that was used as to sign in with Apple ID in them , the only way to obtain mail address is from the recipients ( that you used to send mails from the devices ) , the number can be obtained from cellular services by revealing personal identification proofs .
is the account set up with 2FA or secondary authentication , if credit card was added in the account contact apple support senior care advisors revealing the credit details to them Contact Apple for support and service - Apple Support
If you are lucky yo get Apple ID from recipients for 2FA account use account recovery How to use account recovery when you can’t reset your Apple ID password - Apple Support