One of the tricks of writing, at least for me, is finding out what you're good at and zeroing in on it. The most significant way of doing this is by figuring out what drives your stories: plot, setting or characters. Once you've picked one or two, focus on them. Of course, a book can have outstanding characters, plot, and setting, but that's quite uncommon. Usually a writer excels at one or two things and may struggle with the rest. Think of Harry Potter. The main characters are fairly simplistic, acting as mere vessels for the setting and plot, and that's fine! People still enjoy the story and love getting lost in that world, because Rowling focused on what she was best at.
So if you're great at setting and plot like Rowling, don't be afraid to world-build to your heart's content. And if you can't ever get your characters out of your head, by all means, let them take the lead. A good writer can make something work, even if one aspect is lacking. Do what you're good at. The rest will come, and if it doesn't, it can always be worked on with beta-readers or during your first re-reading. When writing out the first draft of a story, focusing on what you're good at can make it easier to keep going and finally get the full story out.
Great tip, Morgan! I like the idea of focusing on what drives the story. That seems to be a good indicator of where a given writer's strengths lie, the part that comes most naturally.