Hi ( Note this is not a glitch and has almost no negative effect on other players ), to avoid any possible confusion here's what you'll be doing
Simply joining low population game types, why? Because due to their low population, there will be far less players in your region with a similar K/D to yours, here are the lowest population games according to some various Reddit Posts
Classic Mosh pit
Hardpoint
Hardcore Search and Destroy
Capture the flag
Play one of those gamemodes, and you will likely notice a far larger variety in K/Ds between players your matched with. However be mindful that this does vary depending on how many players in your region are playing that gamemode, so expect varied results.