What business do you think it will be the next Coca Cola, McDonalds,Tesla etc ?
Can we set aside first being the next Coca-Cola or McDonalds? Or you are referring to the currently active companies that might turn into big someday?
The important is to think of something good outside the box.
As for what's the business should be, try to analyze the situation we are into then mixed all ideas until we found that
"one".