At 4000€ you can practically choose approximately the fastest of both the CPU and GPU.
I spent about 1500€ on my newest computer, and recently in a discussion on this forum there was a guy who probably had spent about twice as much, and he was disappointed at the speed he had achieved. After tweaking his GPU settings his system turned about to be about 5% faster than mine in this simple SketchUp performance test. To me that proves my assumption that at the high end buying a computer is a game of diminishing returns, especially for SketchUp modelling.
CPU: Your current CPU scores about 2000 in the PassMark single core benchmark while the top CPUs score at about 3000. This would IMO translate into a perhaps noticeable but not that great increase in perceived performance. When selecting a top-notch CPU you might also think about your V-Ray use and not concetrate on single-thread speed alone. I still have a perhaps unjustified bias in favour of Intel CPUs.
GPU: The GTX 2080 Ti mentioned in the thread i linked to is about the fastest GPU on the market. It is expensive, but spending even more on a high-end Quadro card will give you no benefit at all, on the contrary. It is for you to decide whether the price is justified, for instance compared to my RTX 2070 that costs less than a half.