Which AM4 CPU Should I Buy Right Now for Gaming?

Hey everyone! I'm currently using a Ryzen 3600 CPU and a 5700 XT GPU, paired with 16GB of RAM. I'm looking to play World of Warcraft and Path of Exile 1/2 at 1440p. My goal is to achieve stable, high FPS without needing ultra graphics settings. I feel like a CPU upgrade could do the trick, especially since these games don't demand too much from the GPU. I'm considering holding off on a full AM5 build for now since I want to get at least 2-3 more years out of my current setup. I'm in Greece, and I can't seem to find the 5700X3D or 5800X3D CPUs, even used. So I'm a bit lost on which CPU to choose—should I go for the 5900X, 5950X, or 5800X? Am I right in thinking that my current GPU combined with one of these CPUs would suffice? Or should I just wait for AMD to restock the X3Ds? Here are the current prices I'm seeing: 5800X for €210, 5950X for €290, and 5900X for €340.