Here are some actionable ways to update your content:
Conduct new keyword research and see where the gaps in your content are. Most premium SEO tools today can provide in-depth analysis into keyword gaps and even show what new keywords your competitors are picking up.
Find new research to touch on in your article. For example, if you’re referencing a study that was conducted in 2015 but a new study just came out, it’s time to go in and update your content to reflect new findings.
The same goes for timely news stories and events. For example, if you’re a video conferencing software provider, you should update your content to resonate with more people who are working from home.
In general, you’ll want to update a significant enough amount of content for Google to recrawl your web page. Updating a few headers alone just won’t cut it.