Assuming that the red pill lets me revert to a 6YO (thus preserving my knowledge), and not time traveling back to when I was 6, I might be tempted to do a lot of unethical stuff to make a ton of money, provide for my family, convert the remaining assets to BTC, memorize the wallet details, then take the red pill. As a 6YO, the government can't hold me responsible for my adult conduct.

If it's a time travel situation, there's no contest. Red pill after studying the history of inventions. Start out by inventing the Pet Rock (near zero initial investment), reinvest in the fidget spinner, Pokemon, D&D, and writing the scripts to all the blockbuster movies. Provide technical details to the right industries for a royalty. Invest heavily in the creation of the Internet, then start Facebook, Google, and Amazon, bypass the PC and jump straight to smartphones. I'd be the patent king of the world.

With the trillions of dollars, I'd heavily influence politics. I'd fully fund the campaigns of moderates, institute free Internet-based accredited college, set up work training programs to support industries I intentionally locate in depressed areas, and make most of my business non-profit. And maybe, just maybe, avoid the cesspool we have today.

Edited for spelling