Game is CPU bound, and that CPU is not really up to snuff. Even when it released, the biggest con to the chipset was "Low resolution gaming performance". It's fine at doing a bunch of single-threaded tasks, but when attempting to do multi-threaded operations it falls flat on its face. Single-core performance is not far from where 7th-gen Intel CPU's sit, and they're just overclocked 6th-gen chips.
The higher you set your resolution, the more of a load you will be putting on your CPU. It doesn't matter that you have a 3080Ti, your bottleneck is your CPU.
IMHO, the game doesn't really benefit from 4k anyway. It's not like this is CyberPunk.