This is very easy, just load into online and play an elimination match. This really just relies on having good teammates since you're not winning any 1v4 fights no matter how good you are.
Elimination is a 4v4 deathmatch, to best of 5. The easiest way to win is team on enemy players, since your chances of winning a 1v2 is better than your chances in a 1v1.
Also do PvAI, it makes this ten times easier.