I reached diamond from being a gold player last act and this act im trying to maintain the diamond elo and perhaps even climb it. For those immortals and high diamond players out there, any tips? (I have better aim than game sense)

This guy started popping heads at the start of the game and did that the entire game, had like 40+ frags by half. However, the game just continued with our team dying every round within 30 seconds and it just wont stop. We didnt surrender b...