You are already using the Nvidia drivers. Drivers are handled much differently in Linux; you really don’t go on some website to get them. Either they are built into the kernel or handled with kernel modules that you can install using the terminal (or Garuda’s GUI tools).
What you are probably noticing is that you are in a Wayland session with Nvidia drivers but are not using Direct Rendering Manager (thus the system is feels sluggish).
For more information, click this link: