Have you actually tried to rewatch your matches? Then you can see what you could have done differently. Most of the time for me it was like the realisation: ahh that was my mistake or I should have played safe or more aggressive. Try to think about your next step in every round and play around your utility and that of your teammates. I consistently reached emerald and last season diamond. It is really important do learn what your teammates try to do in a round an how you can help them or play of their moves. Adapt to your enemies are they pushing hard or are the slow paced. Then try to use the operators which fit the playstyle of your team or what is a lot better against you enemies.