I also have a multi niche site and also got hit hard, about 45-50% down in traffic. I've also heard elsewhere people with multi-niche sites got hit. My site is about 85% informational and about 15% affiliate.
However, even if you take my topical authority as being less than some of the more specialized sites out there, my content is still often twice the quality of those sites. I've also lost all my snippets. I'm so angry about losing my snippets, because I don't see any good reasoning for this. Content is still great, unique, original, easy to read, interlinked, externally linked, all the stuff... and everything according to Google guidelines (I think).
This hurts. It's almost as if Google has no idea what quality my posts actually are, and just according to some indirect signals punches me in the balls. Since this is my livelihood, I'm therefore being forced to create a new site and to look at other possibilities, such as AI tools, to get me back on track. I've trusted Google process so much, but now I'm on the fence... still waiting to see if this remains.