Keywords are too hard when your site struggles to appear on search engines even after effort. Usually, very popular keywords are highly competitive, so new or small sites may not rank for them quickly. One way to check is to search your keyword and see how strong the top pages are. If big companies dominate the results, it may be difficult to compete at first. You can start with simpler keywords that still relate to your topic and gradually aim for harder ones. This gives your site a chance to grow steadily. What do you think?