I think you might be right that FIRE, as a movement, has sort of crested that initial wave of public enthusiasm and is not the topic of conversation that it had been, but is still flowing quietly in the background for a large number of people.

I think what the Reddit sub had going was lots of new or curious people asking questions and people providing feedback. It seems like we only have a small group of people that are already on the path, so we don't have much to talk about. If the back to basics approach drew in new people, that might help to get things started here. But I've always tended to be more of a lurker, so I don't have many ideas about how to increase engagement.