Some comments;
a 10900 is overkill for this sim (or any game or sim at that). It will simply not utilize those 10 cores / 20 threads.
Maybe check out the Ryzen 5 5600X (6 cores / 12 threads, and better single core performance than the Intel counterpart. Single core performance is king for CPU’s in this sim).
If you’re dead set on Intel, consider a 10700.
GPU wise; what resolution are you targeting? If you’re going to be running at 1080p, then a RTX3070 will be overkill. If you’re looking to be running 4K or VR at ultra details, the RTX3070 might be not enough.