I feel like I could be using my fox forms better

sometimes I just go insane and kill everyone in my fox form but those r very limited times that I don’t get often so I would like to know the ideal times to go into fox form (not ult) I feel like I’m mainly using my fox form to heal my self when I’m not getting shot at and every time I do try to go for a kill I always die I don’t know if I’m just not good enough or I could use my fox form in better times