He "bounced back" NOT through business, but by acting, playing a successful businessman for "The Apprentice."
More fun facts: Trump has been in over 4K court cases; he routinely refuses to pay vendors, contractors, employees, etc., because he's so fucking cheap. REAL businessmen, successful real estate tycoons, for example, don't have to go to court thousands of times (no one in real estate has even come close to that count), guess why? That's because they pay their vendors, etc. Which is good business.
I know why Trump is richer than I'll ever be, and it's all because of his father. I'm a better businessman than Trump; I've run a business without a single default or court case or bankruptcy.
That's not bragging, you could randomly pick any Arby's franchise owner, and they'll likely be a better businessman than Trump. It's not hard.