Ultra with ray tracing? Or just regular ultra settings?
If you aren't already, run in DLSS Quality mode.
If you aren't using ray tracing and have already enabled DLSS, your CPU will be causing the issue. Why do I say this? I play Cyberpunk at 4k with my RTX 2080, 32 GB of RAM, and DLSS Performance mode (so 1080p internally) and my fps is usually high 50s to low 70s, and my settings, rendering resolution and even GPU power are similar to yours (the 2080 isn't too much faster than a 2070 Super). So what's the difference? My CPU. I have an i7-9700k overclocked to 5.1 GHz on all 8 cores, and when I drive through night city at night, I can see that all eight of my cores are being almost fully utilized. If my heavily overclocked 8 core CPU with significantly better IPC and single core performance is close to CPU bottlenecking me at certain points, then your 6 core CPU with much lower boost clocks, weaker single-thread performance and lower IPC is likely to bottleneck you in this situation. Cyberpunk is very heavy on the CPU at Ultra settings and doesn't run very well on many last-gen Ryzen CPUs. Digital Foundry did a test on Cyberpunk with a Ryzen 3600 and found that when driving through the city it was impossible to hold 60 fps; they were constantly CPU limited.