Help with tracking targets vertically

[errant garden]

I have a bit of a strange question. Because of medical reasons, I can't use my arm to aim, I can only use my wrist and fingers. Because of this, my sensitivity is usually 22cm/360. My issue is that if I'm tracking a target vertically and they go too high up, I can't push my arm up to keep tracking them. So should i increase my sensitivity or get better at resetting my mouse position?

[hollow walrus]

Aim is genetics

[runic echo]

increase vertical sens