To follow on from James' comments about monitors, 2k/1440p/QHD (different names for the same thing) are the sweet spot right now in my opinion especially if you're also looking at higher refresh rates. It's obviously game dependant but RTX3090's can push 4k at over 100fps on average but you'll see dips in to double digits still. I think some of expectation over resolution is due to referring to them by only one edge, so some people think 4k is twice the resolution of 1080p but as the pixel count on both edges double, 4k is 4 times the resolution of 1080p which is why it is so hard to get high fps. A 1440p screen though it 'only' 1.8x the pixels of 1080p so still a nice resolution increase but without quite the gpu hammering of 4k. Most of the systems (sensibly) being linked are RTX3080's which on high settings should on most games keep you at or over 120fps on average.