You should focus on using long tail keywords for a start. This is a great SEO tactic since long tail keywords are more commonly searched than regular keywords. Because they are specific, they have a higher conversion value.
Use your keywords in titles, headings or subheadings.
Next, you need to make sure your article is readable. I highly recommend you try out Yoast. It’s a great plugin that can help you quite a bit with your writing. Oh, and Grammarly is also a great tool. You can use the free version if you don’t want to buy a premium membership.