If you start adding good ranking keywords in your content, it will not be recognized as meaningful or quality content by Google, which is their priority. keywords should be added naturally and where they seem appropriate or else this practice is considered keyword stuffing. You need to understand that Google is smart and has been doing this for long, it will recognize keyword stuffing and will penalize those who take part in this.
Always use website testing tools to keep a check on the use of your keyword.
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