Running this query gave this graph.
As we can see activity in terms of total questions asked has significantly declined. Since the peak in 2017. And as per my knowledge excluding myself only three other users have crossed the 3K rep threshold out of which only one is still active that again I can't say with 100% assurity because I've not been active since the past 7-8 months.
In essence we've had no new close voters while many other regulars have stopped answering /asking questions or reviewing (Yes, I'm one of them).
Does the community feel that this decline in activity is troubling or was it inevitable and nothing can be done about it?