Sometimes I’m constantly getting high impact kills and helping to win games, sometime I play horseshit and cant seem to even get 10+ kills. Is there a way to improve and become more consistent with my plays?

So I'm out playing a ranked game, and my team gets the spike down, I'm looking for something to do. Suddenly KJ ults near CT. She was the last person standing, but my 5 were about to get forced off. I pretty much throw myself at the ult. Br...