I'm a top 100 moira last season so i'll give u my tips what i think.
1: The positioning is very very bad, as moira you should almost never die. I have over 4 E/D ration with moira. That means get at least 4 Elims on each death on average.
2: You are shooting ur balls all totally random and not getting anny value out of them at all. bounce them in tight spots and aim at a wall that you know will make the balls bounce back to a position where it will touch someone.
3: you are not using ur shift ability correctly, you should always use it to get away from fights that u know will kill u, instead u took dmg to 70hp and stayed in the battle, just to die 1 second later. All these small things do a big difference.
You have a lot to learn. If i had to guess a rank ur somewhere in gold. keep practicing =)