Generally interesting shit, as a category, has been shedding audience figures. It's unclear which of the explanations for this is correct.

Could be the rapidly deteriorating attention span of the typical person that now doesn't have to look too hard to find answers to things in the first place anymore. Previous to the internet (not that this is anything new to say), most people had to learn a little bit about most things to get answers about them, especially if it wasn't something they had much of a natural proclivity for. Information retention isn't great either now. So mostly the audience for generally interesting things now is more limited to people with a specific interest in whatever that thing is, and people who just seek out interesting things. Though, and no disrespect to DamnInteresting intended, it also makes the interesting things seem less arcane, which also could be affecting your hits. People can be that way.

Just more focused places to find it, I think. I loved the historical seafaring stories that DI would post, but then I realized that there were subject matter podcasts that dug into these stories even more. So I think it was just specialization taking over.