In my experience, your ability to utilize your relationship with other humans is a better source of success than IQ.

I know plenty of intelligent people that are stuck somewhere in life because they are socially average or worse. Most project I worked that failed didn't because of technical problems but human ones.

IQ may helps, but it can also get in the way.

You know the drill about money not buying happiness but having not enough is a drag ? Kinda the same with IQ and success really.