I don't have better ideas than you to do anything except "buy indexes".
Everyone is happy enough to give Elon (and others) more and more leverage to buy politically strategic companies (this is not that, this is probably just an ego buy for him, something to kill time because he can).
I was worried about him selling out (from an overall market and even index perspective when they were going to bend rules), but it looks like largely the whole situation is predicated on the idea that he can't or won't sell. I don't know how exposed the market is but it doesn't feel good.
Well, if we taxed the top percentages of income/wealth more, and actually enforced anti-monopoly rules, perhaps we wouldn't be in this situation.