“Nobody knows anything”
Oscar winning Hollywood screenplay writer William Goldman once said about the fickle nature of predicting whether or not a movie was going to be a box office hit.
To hedge their bets the studios will produce many movies a year with the knowledge some will do better than others.
Business is no different.
If you just have one go at something and it fails you will go the way of the dinosaurs. Try lots of things (learn from them) but keep trying. With each spin of the wheel you increase your chances of having a win.