You are offered the position of Absolute Dictator of the United States for a period of 10 years. You can implement any changes to the Constitution, fire anyone, disband anything, change any law, even have people arrested and imprisoned or executed. True absolute dictatorial powers to remake the nation in the image you desire over the course of a decade.
But the catch is that you personally will be put to death at the end of the decade no matter what. It's the one thing you cannot change, cannot avoid, cannot alter in any way. Even if you do the best job ever, you will be put to death at the end of your term. So no clever 'I would change the rules so I don't' or 'I would flee to another country right before it's over' or other dodges like that. You absolutely will die after the term is over. You in essence will be performing a soldier's sacrifice, but only much more effective and individually focused. Instead of giving your life for your country in the hopes of saving it in the abstract, you personally will be able to actually save it in whatever form you think that takes, but you will absolutely be giving your life for it.
Do you take the deal?
I mean, if you die a week before the 10 year mark, they can't put you to death at the 10 year mark unless they invent necromancy, which in itself would be quite the accomplishment which would let you circle around it anyways. If it's some divine right God decree of immortality and invulnerability for 10 years... That's a LOT of power and a concerning solid proof of deific power never before seen... But...
I am not smart enough, alas, to solve every problem. In fact, I think I very much would create many more problems, with only 10 years to work with. If I could accept the offer 10 years from now, and have 10 years of peasant-level prep time to learn and plan, then probably I could effect change for the better. But just the 10... it's a toughie. I'd probably lose 5 just sorting out what is needed, and what is needed likely has, itself, a minimum of 5 year lead time, minimum.
The dying at the end part is, ultimately, an unnecessary part of the thought experiment. We all die at the end.
If I could leverage the obvious divine blessing, I might be able to get a strong enough new faith going that could continue the great work once I ascend, but again, all the options there, it would take time to parse and plan. It is easier to destroy than to create, and it took 3 generations of planned sabotage and destruction of our institutions to bring it to what it is today from its heydey. 60 years of destroying.
I would just greenlight all-in on Mars. Best and most logically moral, which will include some brightest but not all. The USA itself cannot be fixed in that time, it is a write-off, but its descendant might have merit.