Oh man, I see no reason why a 2080ti wouldn't have more power than what is on most current consoles. That should still be a really strong card. I would definitely play around with graphical tuning by turning off things that aren't necessary to you (ie - I kill things like reflections, motion blurrrrr, or distant shadow LOD, shader type). Also I wonder if you have another bottleneck somewhere. What is your power supply, ram, and cpu?
You may hate me for saying this too, but I would urge you to try 1440p ultrawide screen with high hz, say 120-144. 4k can grind even the best computers to a halt with how poorly optimized it is. I switched and I regret nothing, haha.