Do you have a thesis for why that might be happening? Ageism? Overqualification? The next generation of hiring managers not knowing what to do with you? Past experience being deemed irrelevant to modern SWE problems? Is it all just a bad market? Your profile strikes me as the last one that would struggle with landing a gig.
Uncertain outlooks in general + why hire people if AI soon will solve everything everywhere all at once?
The simple answer is we are in a recession and no one wants to spend money on new hires right now if they can avoid it.