Ohh, even in Gold+ you don't see a good cooperation.
Just adapt better on what your Teammates are doing.

They focus the tank? Help them so he dies first.
Your team is running around like headless chickens, push the crystal alone while the enemy's follow your team.
You team is not focusing anyone, make focus calls with the macros and attack the same target as your strongest teammate.

Also, don't blame your team for your low rank, it is your own fault when you don't climb.