i think the biggest gap at that range is less about mechanics and more about cleaning up decisions. a lot of 2k players can shoot but their utility usage is predictable, they peek the same angles every round, or they default to known timings without mixing it up. if you watch your demos, mark every round where you took a fight that didn't need to happen. it stacks up faster than you think.
one thing that helped me was playing retake servers with a focus on isolating duels. not just monkey swinging, but actively cutting off common routes with your util and forcing uneven trades. when everyone's aim is sharp, the guy who understands how to manufacture a 2v1 on a site wins most of the time.
try recording coms too if you don't already. half the rounds you lose in pugs are because nobody calls a clear plan for mid control or a default spread, and three people just wander toward the same fight.