The article: About your Apple ID email addresses - Apple Support is updated and it implies you can use a rescue email (if you set one up -- if you did not, it is too late to do that now) to reset your questions: "If you ever forget your security questions, you can use your rescue email address to reset them. We also send any account security-related notifications to your rescue email address." How you do this exactly is not clear and my research into this reveals it may depend upon your region. Here is one possible way (from: https://www.alphr.com/we-do-not-have-sufficient-information-to-reset-your-security-questions/ ) but I have not tested it beyond the first step since I do not want to experiment with my account. ;-).
1. Visit this page and enter your Apple ID -->.https://iforgot.apple.com/password/verify/appleid
2. Enter your rescue email address and have a verification email sent there to reset your password.
3. Follow the link in the email to reset.
If you cannot get any of the above to help with resetting the security questions then realize that several years ago Apple transitioned to using to two factor authentication instead of security questions. Apple has since been encouraging users to switch to the newer security system and your only recourse may now be to try to change to two factor authentication as outlined in this article --> Two-factor authentication for Apple ID - Apple Support Follow the instructions in the section "Turn on two-factor authentication for your Apple ID"
If you can neither reset the questions, nor switch to two-factor authentication, you may well have lost any access to that account.
If you wish to speak with Apple about this, contact with Apple ID account security using the information in this document --> Contact Apple for help with Apple ID account security - Apple Support
