This is a really good question. And I don’t have the perfect answer.
I usually try to focus on articles that I perceive to be under-performing but that is highly subjective.
As noted in the article, sometimes my meddling actually causes set backs, SEO-wise, which makes me question the efficacy with this.
The best solution is to probably make your content as evergreen as possible.
While this was a broadly applicable topic, I knew that the answer to the question would change over time, requiring maintenance anyway.
My best articles require little maintenance, other than maybe changing the meta description. Google changes the automatic meta description (whether you enter one or not) over time, so I’ve had articles with no custom meta description drop in traffic simply because Google is pulling up a weird or usefulness meta description.