I think I would like to pass it on to someone with more capacity to get it right than me though.
OK I will have a little shot at it for fun.
Stop all wars and bring everyone to an "I'm OK your OK understanding.
Then I'd start with the children and the elderly, fixing up all the sick kids, then the bodies and minds of the elderly, infirm and ill. I would fill the belly of the hungry all over the world, and ensure there was plenty of clean food and clean water. Then I would take a short break and think about what else I could do.