I forgot the security question, need help

Try using Apple's iForgot service.

If it says they don't have sufficient information, you need to contact Apple's Account Security team. To reach them, click here or here and pick a method; if you can't use any of those listed, pick one from this page.

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See Security and your Apple ID https://support.apple.com/en-us/HT201303

This document says “without proof of your identity via security questions and other carefully selected criteria, Apple Support can't help you reset a password or perform any other actions on your account.”

Thus, given that you cannot answer your security questions satisfactorily, we can do nothing to help you, except to mention that Apple support might help you if you have an extenuating circumstance (e.g., you have the receipt for your purchase of a pertinent device with its serial number on it). if you want to contact Apple support to discuss any extenuating circumstance, see these support options.

Get a call from Apple support to help solve your problem using this link https://getsupport.apple.com/?caller=kbase&PGF=PGF63005&category_id=SC0245&symptom_id=23362

Apple ID Support https://support.apple.com/apple-id

Apple ID account security for country-specific and region-specific help https://support.apple.com/en-us/HT204169

Get Support: We’re here to help https://getsupport.apple.com/. Go through the options to find the best support option.