I have a blog post dated 2014 that ranked #40 in semrush. The KW has 15 keyword difficulty on KW Finder and 18 on long tail pro. It has 9,900 monthly searches on keyword planner. The article is not SEO optimized and don't have any backlinks to the url. Also, the content that discusses the KW is only 77 words but the whole article is 500+ words. I'm planning to rewrite the whole article to SEO optimize and build some links to it. Is it OK to do the rewriting?