I am writing review posts and I happen to have my keyword density around 3% because I am reviewing a product. I think that is high, but I really don't know how to lower that without removing content or calling the product "it" instead of the real name. The thing is that I tried to lower it by having many LSI. My problem is that if you sum the keywords and LSI for the entire post, the % will be huge. Should I worry or continue with it?