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!