Is it possible to be good at this character while sucking at hitting sleeps ??

Basically my sleeps are really bad. I try flicking it but I miss constantly, however sometimes I will have rare matches where I can actually hit quite a few. Most of the time though I only get like 3 or 4 sleeps which is pretty embarrassing.. most of the time it is on the enemy tank as well.

When I am getting flanked I tend to panic and just hit sleep without actually leading my shot and I really need to stop :( its particularly bad with characters like anran venture reaper and tracer.

The easiest ults for me to sleep are soldiers and cassidys, the rest I have a hard time with for some reason.

My nades are good, I don't die often and I get good heals. My nanos work out well most of the time too.

Idk I really love playing ana because whenever I CAN pull of a good sleep, or when I get a really good anti + nano it feels so rewarding. I even bought her mythic gun.

Are the sleeps something that just come with time? Should you flick it or no? Any advice would be appreciated ❤️