Now that Epic Games has cut off Mac/Linux support for Rocket League, what are my options to get it back? Do I need to use Lutris now somehow, or can I just use a specific compatability layer in Steam?

Pissed at Epic for doing this, I thought support for SteamOS was supposed to be easy for devs using Proton?

Edit: Heroic Launcher was the solution, and very easy. Thanks to all!! Edit 2: Heroic Launcher version was being weird with a controller so switching RL on Steam to Proton Experimental also worked.