I feel like the people saying “red pill because I’d use my knowledge of history to make way more than $10 million” arent considering the psychological cost of a reverse Big scenario. Being a child with the knowledge and memories of an adult would probably be pretty traumatic! 
Imagine meeting someone and knowing you are supposed to become best friends but he’s a child and you can’t relate to him at all. And that’s the way things are for more than a decade.
Here’s another one: Let’s say you somehow manage to overcome foreknowledge and marry the same person. There’s no chance you end up with the same children — something will shift the second time around — but you’ll remember the ones you had in your past life.
