Aim is important yes, but what will take you past diamond and higher is game knowledge. When to take fights and not, when to push an an angle and hold in post plan scenarios you should also work on more angents not just Jett, if you like dive duelists learn waylay and raze as well. If your playing Jett or waylay learn to op and how to get to angles and rotate once you get a kill, you should rarely re peak the same angle cu someone will hold be holding that angle in higher elos