What we can do right now is linking older posts in our own newest articles...
Yesterday I read an article by @jerrybanfield who linked to one of his friend's articles. I also found very helpful posts using YouTube since people put a link to their Steemit post in the video description.
I'm going to link helpful posts in my future articles so hopefully it makes a little difference now.
Yea, I think its a great idea to put previous or helpful posts in a subtle way in a footer or header. :)