Now this is THE question for the daydreamers!
I would become a scientist and find a way to make my hot air balloon, provide solar energy for everybody and invent devices for it.
I would also become a Peace and Education spokesperson making schools and public libraries where people have never even seen a book before.
I would convince the governments that in the long term wars serve nobody and the weapon industry turn into natural energy sources businesses.
I know it sounds impossible, but if you think about it if 200 years somebody told people that mankind would make journeys in the air and go to the moon as well, they would think of them crazy! So we should always hope…