The best idea maybe is write this keyword in your content with bolded text or insert in h1,h2,h3. Your need a logical content, not only keyword, your content need give some to your visitors. And adding some backlinks with your keywords variety to your website.
Try create some landing page with a specific keyword and link this page with your project principal page. I recommend use de moz One-page Optimization for gets more information.
Important don't hide text in your website
