I will tell what I would do: I would diversify. 358000 USD is a lot of money and it allows that.
I would certainly keep a big chunk of that money as Bitcoin. At least 50%.
For the rest I would buy alts, stocks, bonds and/or a property which I could rent out.

Edit: don't forget that if he keeps that in his own wallet, he also has Bitcoin Cash, which with some extra care he can sell. Also for such values I hope that he uses hardware wallet.