Why am I not getting any better

I think most people are forgetting the biggest reason why you feel you are not getting better. The truth is that putting that much time you definitely have gotten better but sbmm just continues to match you with better players as your skill increases. I am a significantly better player now than I was a year ago my my k/d is actually worse now than some seasons prior to the ramping up of sbmm. Also the player base as a whole has probably gotten significantly better as well.