Please bro. Just one more particle collider. This one will solve science. The last one wasn’t big enough. Please keep it in desirable real estate though.
Each bigger one has in fact solved more of physics, after being built precisely because there was a good theoretical case for a higher energy collider being helpful.
As somebody slightly better informed (physics degree, following popular science): It really isn't looking great for something that could be found at a small multiple of current energies, but not at current energies.