Stack Overflow has seen a substantial decline in traffic over the last year that appears to be accelerating. https://observablehq.com/@ayhanfuat/the-fall-of-stack-overflow
I think it's worth testing it with the free 100 searches. All you need is an email address (no credit card unless you're actually subscribing). I've only been using it a few days but I don't think it filters out AI generated sites. But you can set a ranking by site (block, lower, normal, raise, pin) so you can make stack overflow be priorised and block quora.
They have a ranking board of top sites in each category so you can go through it and set the rank of a bunch of sites upfront.