Use AutoLeave it makes my idea come true in much better form than this...

Rocket League plugin to BakkesMod

PowerToys - Currently, the main focus is on automatically enabling queue for the next game after finishing the previous one!

Installing

1. Install bakkesmod here
2. Download a recent artifact here
3. Put it there C:\Users\URNAME\AppData\Roaming\bakkesmod\bakkesmod\plugins
4. Enable it in the game -> F2 -> Plugins -> PowerToys! -> Enable plugin -> Enjoy!