Seriously kill lots and lots of people... seriously. This can only be done in Competitive matches! Playing KotH (King of the Hill) is a surefire way to rack up lots of kills as there is no kill limit, just a score. The boosting method would consist of two players with two controllers playing the 2v2 Gnasher execution matches; choose a region that is not your own and search at the same time and hopefully you find each other.