That's funny. I checked out your Twitter after the submission started trending on HN and saw that you posted the traffic stats. I actually wondered whether you would figure out where it was coming from, so I'm glad you eventually did!
Regarding your question I don't think there's any good way to engage with people after the thread has been "archived", especially since there are no DMs on HN.
Glad I could contribute to some excitement nonetheless. I posted it because I thought it was a cool and novel approach to a classic problem. I also really liked the article (and your homepage/games in general). Keep up the good work!