It's the same with writing. Practice is key. To hit all the right notes takes time and patience. Rough drafts are exactly that - rough. They are a foundation to build on. The more one works at it, the better the story sounds (reads). With vocals, it's all about flow. Same with writing. Nothing needs to be too wordy. If it is, edit until it's right. Honing your craft isn't a singular task. Get together with fellow writers and listen to their tips, implement them into your writing and work together with them. This doesn't mean collaborating with someone on a book or article, although some partnerships can be very rewarding, but have critique partners in your favorite genre you can trust, and bounce ideas off one another. Get in tune with your characters and plot, polish them until they flow easily, edit away any unnecessary stuff and then you'll be ready to release your product to your audience. It will be good, and folks will like it.
Lastly, even though you may be alright with writing in multiple genres, I believe it's best to stick primarily with the one you're most comfortable with. Your readers will expect you to do that. There's nothing wrong with branching out, you'll pick up more readers, but don't lose the ones who expect a certain product from you. Also, keep practicing (polishing) your craft. Stay at the high level you've worked hard to reach. Writing, like music, is an art. When done well, it is appreciated by many.