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?

Add a deathmatch map. These maps are not designed for random spawn duels. They are designed for bomb site plants and retakes with abilities. Fix the respawn algorithm, too often you're getting shot in the back or side while 1v1 another play...