What do I do if I don't remember my security answers, but it won't let me change them it keeps telling me that there aren't sufficient reasons?

Do not try to sign in or change your security questions for a full 24 hours. After 24 hours, if you can, 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 Two-factor authentication for Apple ID - Apple Support