Two thoughts.

1. My IQ is just normal, and I am not being humble. Perspiration is main ingredient in inspiration and success. Of course the family and community you are born into are huge too.

2. The decision to let rational thought flourish and be on guard against irrational influences does not primarily depend on IQ. It is born of radical honesty and a willingness to fully explore ideas, beliefs, sources of information/disinformation, etc before making final judgments. The ability to admit that one has been wrong about something is also huge. Character is way more important than IQ.