Man i think it's really hard for me not to crouch and shoot when I'm playing, does anybody have tips on how to stop or when its best to crouch and shoot because I feel like it's holding me back.

Choose ur own 3 abilities for them and ult. An example and my own choice would be, Raze nades, jett smokes, and prob yoru or skye flash, with yoru or reyna ult. And make it reasonable like something that would realistically be added