You can replace DLSS with AMD FSR 2.0 in Cyberpunk 2077 with this mod [TechSpot]
View Article on TechSpot
According to its author, enabling FSR 2.0 via the mod just about doubled their 4K performance on a GTX 1080, to 45 fps. And, as you can see for yourself in the screenshot below, the quality is phenomenal compared to the game’s FSR 1.0.