Can't switch to NVIDIA graphics card on Wayland KDE (Integrated NVIDIA/Intel)

If that’s ok to you to still use Plasma on Intel, but run every application on NVIDIA as mentioned, i think that may work for you:

Create a .sh file on /etc/profile.d

export __GLX_VENDOR_LIBRARY_NAME=nvidia
export __NV_PRIME_RENDER_OFFLOAD=1
export __VK_LAYER_NV_optimus=NVIDIA_only