Inscrivez-vous ou connectez-vous pour rejoindre votre communauté professionnelle.
In my view or experience, there is no ideal % or ratio of Keyword density, I prefer 1-3% of keyword density in a content.
It is around1 to1.,5% as of now. But if you are using appropriate jargons of your niche, it can be less. The importance should be given to the user experience and blending in closely associated words or concepts. And it will automatically help you generate more traffic over time.