To add a tip on how to make it match your own style: You can get decently far by pointing it to a page or so of your own writing, and simply tell it to review the post section by section and edit it to match the tone and style of the example. It's not perfect by any means, but it will tend to edit out the type of language you're not likely to use, so really to make it sound less LLM-like, almost any writing sample from a human author works.