So you had a good launch on Product Hunt - what's next?

I've been wondering this for a while myself - so I come to the community, especially those who had experienced this first hand, you had a great launch, you got a few hundred visitors on your product, perhaps even a few thousand visitors - what's next? In my experience, the visitors die down after a certain peak point and the product drifts into irrelevancy shortly after - how do you maintain? Especially if you're a bootstrapping solo indie maker? Do you relish in a few loyal customers that still use your site? Where do you market it after? What's the strategy? I've seen tons of Product Hunt launch guide, but rarely seen post-Product Hunt launch guides. I guess for some people its an obvious path, for me - not so much. So yeah, looking forward to some wisdom from the pros :)