We're dealing with uninteresting topics. The "hottest" topic of discussion in the last months is Ordinals, followed by ETFs, and then an endless list of speculation-related threads, which were always a "thing" in the past, but gosh, that just seems like our sole concern nowadays.
It seems that most of the topics from the technical side have already been discussed enough times, someone could think that everything has already been said. New projects (Bitcoin-based) do not appear that often or at least they do not consider it important to have a presence on Bitcointalk.
The activity is dominated by casinos and instant exchangers for which, this forum is a solid source for marketing activities. None of these branches require activity in technical discussions, it is more a matter of presence.