I'm stuck in low immortal and always bottom frag, I aim train but everyone still has better aim than me. I try to vod review but am unsure what I'm doing wrong I try to play sentinel or initiators to help out the team. While playing those...

I find myself crouch shooting too much and don't really know when I should not Crouch shoot. Any tips or certain scenarios when I shouldn't Crouch shoot. Any tips are much appreciated. Thanks.