Your kid needs to find something that they will do with their life. It has to be something that they can do for a living, but there are no other restrictions. They don't really have to know this until they're old enough to starg working (the sooner the better, though).

Let them play, but--and this is key--play with them, and notice what they like playing with. Learn what their dream is, because that's the best thing to be successful at.