There is no problem, though your concern is thoughtful, the forum continues to be active, except that it's not always on BTC core discussions. This can only mean there are no Bitcoin trending/hot discussions to discuss which is not the fault of the forum and its users.

When Ordinals was trending, no one forced it, it was well discussed, and the same goes for the ETF and the former ones before them. Tell me, which one is trending like them now? There would naturally be more topics to discuss when Bitcoin and Bitcointalk were still new than now when almost all important discussions have already been discussed. Things will naturally spice up when important developments happen around Bitcoin, like the ETF of last year.