What makes a great designer is how they elevate that process. Great designers have intentionality for the outcomes they’re solving for. They are visionaries, able to see how individual projects fit within the big picture goals. Great designers are opinionated. They are able to map out the reasoning behind every design decision they make. Great designers are generalists and collaborators dedicated to the problem, not their own solutions.
The FAQs that got me more UX interviews (and ultimately my dream job)
Allison Milchling

Julie Zhuo’s article goes into greater detail on some of these points: https://medium.com/the-year-of-the-looking-glass/8-unintuitive-lessons-on-being-a-designer-ca7e97a572ee