I don't think you will be seeing any major improvements from upgrading any of the other components instead of the cpu.
If you have viewport lags, maybe you could upgrade the GPU, but I am getting excellent performance on a 1650 so no real benefit to be had there, not to mention that gpu prices are forbidding.
If you are dealing with larger scenes or lots of displacement and you are filling up you ram (>80%), you can upgrade to 64gb, because you could be seeing excessive loading times if your system uses your swap file on the hard drive instead of ram.
That's as far as you can go I'm afraid, but from my own experience you can save a good amount of render times by optimizing the scene, which can mean file size / save times, material properties, layers that help keep a scene tidy and can be turned on/off etc.