Since a Myth is just a false or made up story, you can use it as an example to tell a morale of a story to be applied to life lessons ^^ or It can be used to represent a Scenario

For example: The boy who cried wolf until there was really a wolf and no one listened to him until he was really getting attacked by a wolf.

The whole point of that myth, is that you should never lie in life, because when you are telling the truth, no one will believe you!

That's what you can use a myth for ^^ I hope it helps