The dollar store knockoff of Fortnite, 1v1.lol is a third person shooter which includes several games like Team Deathmath, the 1v1, 1v1 and 2v2 comp, Battle Royale (which has up to 8 players) and Zone or Zone Duos.
There is also Gulag, which is similar to the Call of Duty Warzone gamemode, where you get sent to a room to kill another enemy, and if you survive, you get sent back into the game.