There are several ways to update existing content and achieve higher rankings.
One way would be to use tools to get your recommendations such as Cora and so many others.
You can also use ChatGPT as I discussed earlier talking about intent sometimes it's useful to use ChatGPT to see exactly what that is. Use a prompt similar to this "I'll provide a blog post on (your topic) and a list of related keywords. Please identify any keywords, entities, or subtopics missing from my content based on the keyword list. Now paste your blog post/ article into ChatGPT and your keyword list you gathered earlier.
BoOm now you have a good idea of what your content is missing or needs to be updated. There are a million ways to accomplish this, as this is just one example to help explain it, especially to beginners or people who aren't this far in the game.