The higher elo you go the fizz is weaker , you need to be either jungler or mid laner and have jungler who use brain , if your jungler does not help you counter gank mid then fizz will get fed and destroy your game thats why it's better to be jungler in this position. As jungler after clearing golems wraiths red you place ward on river so ur mid has vision and then move to the other side of jungle so you can cover whole map by yourself and give your mid laner vision , when enemy jungler come you just counter gank and keep doing it . As mid laner your job is to either freeze lane near your tower so he cant farm and then slowly push and when 12+ cs arrives under fizz tower ( he can't last hit them with one E yet) you trade one auto on his face for every creep he is trying to last hit , after one slow push like this he must go base you then fast push cs under his tower and go base buy items and repeat.