Not convinced working for government is the best use of your potential, though considering he owns 5% of all US Treasury Bills, I wouldn't say his impact is any less than being a government employee.
Well I don't think him sitting on billions of dollars at 94 is better from a societal perspective.
Besides all that he has advocated for that money to be taxed away from him for decades.
He pretty famously lives below his means in a normal suburban house and drives around in a car that most software engineers could afford (Cadillac sedan).
From a societal perspective, I’m not sure you could ask for much more from any one man.
Even as T-bills they're doing something.