I’m not affiliated with this YouTuber, but I thought this might be useful to someone else. I have a RTX 3080/Ryzen 5800x/32 GB machine and was hovering around 30-40 FPS even after turning a lot of settings down. I think I just haven’t kept up with the best combination of settings. This video got me up to an average of 70-80 FPS (except for in denser areas, where it can drop to 45).
I never use DDU, just install over the prior driver. I run 3070, i7 10700k but only at 1080 resolution. In high/ultra settings I tend to sit at 120+ fps. Can’t hurt to try ddu if there are issues