Just cash in the ticket. If anyone asks you for money, say “No”.
Take the lump sum and park it for a while. Don’t make financial decisions immediately.
It isn’t easy to “park” that much dough, so you will at least have to make some early financial decisions. FDIC only covers up to $250,000 per depositor, per bank, so if you want to park your millions in the bank, you’re gonna need to go to a helluva lot of separate banks.