How do you get a unicorn startup?

How exactly does one go about acquiring a unicorn startup? Is it through sheer luck, strategic investment, or perhaps a combination of both? Are there any key factors or traits that these companies tend to share, which may offer insight into their success and attractiveness to investors? And, for those looking to get in on the ground floor of the next big thing, what advice would you offer in terms of identifying and nurturing potential unicorn startups before they become the next household names?