I am constantly updating my old articles/posts. They get longer and longer as I add new knowledge and insights. I think (but cannot prove it) that Google and other search engines recognize when I update them. I seem to get a lot of non-Medium readers, which is fine with me.
I also have a web page where I list all my articles based on when they last received a major update:
By the way, if you want to submit that 2019 article to New Earth Consciousness, I can give it place in the Oldies But Goodies section of the publication front page.