Some maps offer good opportunities for different agents and their abilities. Sage for example can be used on Haven on B side to block the entrance just with the wall. With this tactic she has some time to rotate and support other agents.
The trick is to know all these opportunities for the agents and user them if you want to. Another example is A side on Bind. You can create a one way smoke with Viper or Omen just by placing a smoke on the box on short. You can see the enemies legs, but they can’t see you. It’s not important to use these tactics every round, but it should be in your mind if you are creating your team comb.
Often an agent like Cypher or Chamber is very good, as he can cut off certain paths with his traps. You and your team will be alerted by the fact that an enemy has destroyed Chamber’s or Cypher’s trap or has passed through it. This is very good on maps like Breeze, because you can easily ignore the tube in front of A with a Chamber trap. If there is a trap there, you can focus on another spot.