Rocket League.
I've always liked the simplicity that still allows for a very high skill ceiling. Other than a few hitbox differences between the various cars everyone is on even ground, there's no loadout or customization or different characters with unique abilities. It's why I always liked a lot of arena shooters too, like in Halo everyone spawns with the same skills and weapons.
It also means it's relatively easy to drop and pick up again. Because you won't come back to some new "meta" where everything is different and there's some new weapons and people will shit on you if you pick the car that was good the last time you played but now it no longer is. While there's advanced moves and people will give you shit for playing poorly, the game has remained relatively unchanged since I started playing back when it first launched.
Also there's 1Vs1 up to 4Vs4 so you never have to play with randos if you don't want to and no friend is online to play.