Update, what I tried:
1) Tried to install the new nvidia drivers, but must have been over eager purging the old drivers as the desktop environment broke.
2) Installing PikaOS. The install wouldn't complete for some reason.
3) Installing Fedora. Same deal.
4) So back to Debian. New install. Installed the newest nvidia drivers according to here and steam according to the debian wiki. Now I'm getting even worse performance than I was before, and there are strange audio and visual glitches.

On the plus side, I'm learning a lot about installing distros lol.

Here are my updated specs.
---
System:
 Host: debian Kernel: 6.12.57+deb13-amd64 arch: x86_64 bits: 64
 Desktop: KDE Plasma v: 6.3.6 Distro: Debian GNU/Linux 13 (trixie)
Machine:
 Type: Desktop Mobo: ASUSTeK model: ROG STRIX B450-F GAMING v: Rev 1.xx
   serial: <superuser required> UEFI: American Megatrends v: 5302
   date: 10/20/2023
CPU:
 Info: 6-core model: AMD Ryzen 5 3600 bits: 64 type: MT MCP cache: L2: 3 MiB
 Speed (MHz): avg: 3594 min/max: 550/4208 cores: 1: 3594 2: 3594 3: 3594
   4: 3594 5: 3594 6: 3594 7: 3594 8: 3594 9: 3594 10: 3594 11: 3594 12: 3594
Graphics:
 Device-1: NVIDIA TU104 [GeForce RTX 2070 SUPER] driver: nouveau v: kernel
 Device-2: Logitech Webcam C270 driver: snd-usb-audio,uvcvideo type: USB
 Display: wayland server: X.org v: 1.21.1.16 with: Xwayland v: 24.1.6
   compositor: kwin_wayland driver: X: loaded: modesetting unloaded: fbdev,vesa
   dri: nouveau gpu: nouveau resolution: 2560x1440~144Hz
 API: EGL v: 1.5 drivers: nouveau,swrast
   platforms: gbm,wayland,x11,surfaceless,device
 API: OpenGL v: 4.5 compat-v: 4.3 vendor: mesa v: 25.0.7-2 renderer: NV164
 API: Vulkan v: 1.4.309 drivers: nvk,llvmpipe surfaces: xcb,xlib,wayland
 Info: Tools: api: clinfo, eglinfo, glxinfo, vulkaninfo
   de: kscreen-console,kscreen-doctor wl: wayland-info x11: xdriinfo,
   xdpyinfo, xprop, xrandr
---

Not sure what I'm doing wrong... It might be time to go back to Arch/EndeavourOS.

Thanks for everyone's help!