You could try EndeavourOS, it's based off Arch, so 99% of the Arch wiki can be directly applied to your system, and the installation process is much more normal with a GUI and a selection of Desktop Environment to choose from.
The hardest part with Arch is getting the initial setup working imo, so you can put a few more hours trying to install it (if you're ready to bear the frustration that might come with it) or pick a distro like EndeavourOS with a GUI installer to get a working system quicker.
You install Steam, enable proton compatibility (on all games or on RL specifically), download and launch the game. Even more chance that it works on the first try with Arch linux-based distro, since the kernel version is closer to the ones running on the Steam Deck.
If you got the game from the Epic Games store, you download and install Heroic games launcher and proton. In the game settings, you specify the install path of proton and it should be good to go