I think reducing keywords to rank is not even a strategy bro. For example in your case Naturally is not even a keyword. How? have a look at the article on 1st position. They didn’t use the word “Naturally” even one time in the whole article yet they are ranking on the might 1st position for How to get rid of dandruff naturally
The things to do is to create buzz, generate backlinks and use combination of your main keyword which is dandruff.
Also monitor your website in Google Search Console to check for any SEO related errors.
Hope it helps!!