SearX really works best if you run your own node, not using one of the public ones. I run one on a tiny vps and it’s never blocked by any of the engines.
Caveat: you do give up some of the privacy advantages by being the only user. Thus, I invited my friends and family to also use it and it still works perfectly well. (ofc maybe just none of them actually use it and they’re just being polite about it)