I forgot my security questions and I couldn’t reset it. They said “ we don’t have sufficient information to reset your security questions “. Help me please

Do not try to sign in or change your security questions for a full 24 hours. After 24 hours use a device and Wi-Fi you’ve used to sign into the Apple ID with before and try resetting your security questions one more time.

If this still doesn’t work your next option is to try to enable to factor authentication following https://support.apple.com/en-us/HT204915