Another example is the content optimization I did for a Danish B2B Saas company. It was an older article (2 years old), barely getting some traffic. What I did is very simple.
I deleted two irrelevant paragraphs, added 3 new relevant paragraphs, resized pictures, and incresed both internal and external linking. The article is currently ranking on the #1 place in 4 countries with a featured snippet and brought several clients for the company.