1) Get the Affidavit from your wife Parents that should clearly stated as why you don't BC.
2) Effort you made to get the NABC from your corporation ,if you filed any forms
3) If you have any school education document that shows your DOB along with parents name
4) Use national id(Not Passport)
please use the below link for sample affidavit
https://www.immihelp.com/sample-birth-affidavit-by-father-for-us-greencard/
Merge all the documents along with letter of explanation and upload ..IRCC will accept ,
Don't try to get the "Certificate of Birth " from embassy (if you are from india),it is no use and IRCC will reject .