For the tried & tested experience.
yay -S polychromatic
It's cutting edge, you'll be the first to receive new features and improvements from the
yay -S polychromatic-git
Depending on the AUR helper, you may need to manually update/rebuild this package if you wish to get the latest changes.
Install a backend
If you haven't already, you'll need to install a backend that provides support for your device.