I've read drafts from people who truly write well and have come to the conclusion that the biggest thing they're doing that I'm not is revising. I write straight through and maybe do a single pass after to punch things up and get rid of passive voice, and so everything I write reads like an HN comment (which, don't get me wrong, is a useful local optimum for me). The good writing I've watched happen was revised a lot…
This allows them all the benefits of practice in other endeavors. They can experiment, get faster, build “muscle memory” etc.
I don’t know why I keep being surprised that the answer to being good at things is working at it.