PSA: Sudden increases in KDA and winrate isn't a definitive sign of boosting.
But at the same time, while it isn't definitive it is at least a yellow flag.
I used to be a tilty and raging piece of garbage until I realized I play almost 8x better when I have Pandora playing in the background. This caused my mood in-game to go up tenfold and in general make me feel better about playing the game.
That being said, games are going way too fast paced and snowbally.