Interesting post and question. I would invest in clean energy technologies, self driving electric vehicles, vertical farming and of course more crypto. Plus I would like to give friends and family free solar panels and other things.
I'd like to develop a self contained 'farm' like unit run by computer control and robots that you could deliver on a truck. An advanced greenhouse of sorts that produced produce without much human intervention.
Of course if I actually had that much money who knows what I would actually do, when it comes down to doing something it is usually more difficult than you think.