Years ago, when I was kind-of-but-not-really studying yoga, I first heard of the concept of "one freebie". The idea is that every newbie has one pose in yoga that they can do as though they had been studying that pose for years. You just have a natural gift for that pose.
Recently, I'd heard the concept applied to writing skills as well. Every writer has one thing that they can do effortlessly. The trick is to know what the one thing is. For me, I think it's world building.
I love world building, so even if I weren't any good at it, I would still end up doing it well because I love it and spend a lot of time on it. I'm all about being internally self consistent, so that when my stories have something strange in them, the reader can have a sense of how it all fits together.
What's you're one freebie?