When you are teaching someone what you know, it’s not always easy to write naturally.
When you throw in keywords, it’s even harder to keep your style natural.
It’s not that important to worry about keywords. I mean, sure, they can help and it’s important to understand what they are, but answering what your readers need to know is so much more important.
That’s not to say that you can’t include a few keywords on purpose, but this should be secondary to creating an article that’s interesting and informative.
Have you found your writing voice yet?