The amusing thing is, ambition is seen as more "inherent" than intelligence--part of your personality, rather than just a skill--and yet, improving general intelligence (by more than 5-10 IQ points) is nearly impossible, while improving ambition just requires taking some dopamine agonists.
I would think it would be rational, given extremely high intelligence, to self-modify toward larger ambitions. I mean, if the ambitions you have are basically cached thoughts that stick around due mostly to inertia, from the limits you were unable to surmount while you were younger and had fewer resources... then why not challenge them? Ask yourself what you'd truly want, if you had every tool available? In fact, why not ask that now?
Of course, the answer you arrive at, after this self-awareness comes, can still be an ambition that's limited in scope. But it'll be limited by choice by your current self, rather than imposed on you by your limited past self.