Given the opportunity I would conduct research in the burgeoning space industry. Likely in the private sector.
It seems unlikely to me that space flight will become less relevant in the coming century. At the very least, humanity will make a kind of lifeless colony of low earth orbit. The more grandiose possibilities are likely still unimagined, but a real presence throughout our solar system isn’t out of the question.
I want to lend my strength and will and time to this great human effort. I believe that the kind of massive exploratory undertakings, of like only space can offer us now, are the stuff with which golden ages are founded upon, and a golden age is exactly the kind of world I wish to leave behind for my daughter.