Entrepreneur

Eh, investing that much is going to affect the results. With more money (for a lower percentage) Bezos wouldn't get certain people on the board for Amazon, and you wouldn't have the same company. It'd miss connections and guidance that now allows some disaster.

Instead I'd start investing with knowledge of the future. Short Apple then buy when it's lowest before Jobs returns. Invest heavily in web companies, then short them in 1998 for 2002. Invest heavily in the few exceptions at this point, Google, Amazon, etc. In the early 2000s start a mining operation early on. Do not sell all the bitcoin immediately, but do not try to corner the market. Keep selling every so much to keep the market going as much as usual. When it drops buy more, when it goes higher than you bought it start selling until it drops. Short everything in 2007, focus on buying real-estate post-collapse, and keep it going.

Now if you really want to use knowledge you have, get some patents out for some key tech, and offer it at good prices for tech. Invest and gain ownership of the right tech, and then offer it to the right person at the right time almost for free, with the hope that they'll make it more successful. Do small things, invent things that are useful, but really focus on ownership. If you start with sufficient amount of money you should be able to do a very aggressive short for the dot-com bust, and get a lot of money on that.

This has a huge moral cost too. You have to allow 9/11 to happen, otherwise everything could change. So maybe being rich is kind of dumb, given the insane raw power you have. But I guess you could throw it and play enough to be mostly a billionaire by the mid-2000s after having prevented 9/11, this means that the Iraq war would be different and you'd have to plan carefully to survive a changed financial crisis.