Altruistic: building a foundation to pardon medical debt, or tackle some low hanging fruit type problems in your neighborhood.
Pragmatic: Invest most in index funds, and use the proceeds to fund your startup.
Crazy: Alt-coins :D
Invest a third, give a third to charity, and enjoy a third traveling or doing other things that make you happy with the people you love.
I think it's more important to ask, what do you want out of life?
It could be making the world a better place via charitable endeveours.
Or maybe take a shot on making a billion, then you'll need to be super speculative.
Or maybe it's ultra conservative, then index funds.
Or maybe a mix of things, so many asset classes (and many sub asset classes) to build such a portfolio.
Use the All-weather investment strategy to generate a neat return every year without worrying too much about a market crash. All weather strategy means something like: 80% index funds 12% bonds 8% gold/Cryptos
Do that with the $7M and you'll have around $350K every year (after taxes and inflation) for the rest of your life. And best of all, you'll still have $7M (+inflation) to give on to your own children when that day comes.
Your gift is my dream!