Can't do damage

Hi I'm 1year player. I like zeri I always find ger hard to play. Finally decided to give it a try.

I know she is hard to play and I playw her like 15-16games only. Seems like I can't do damage at all. Only last couple of my games I started to fetting kills or doing some damage which ia still very low.

What should I focus. Its very hard mechanic since q speed is limired. Should I acrively hit back , hit back? Am I using ult very poorly that I do no damage. Kinda confused. Need help desperately. Much love