My Alarm is both too sensitive and not sensitive enough.

Hi!I have a ring doorbell 2 that I got for Christmas. I live in an apartment that has front steps leading up to the front door. In the distance in the ring's view is the apartment complex's road. I'll get notifications about things that are about 50 feet away. But when I have a delivery, say Amazon delivers, it can't pick them up. I've played around with the sensitivity, and even configure it to ignore things that are greater than 15 feet away.Why does it pick up cars that drive by that are far away and fails to pick up every single Amazon delivery? It also fails to pick up my family adequately. There are times when it doesn't even pick us up. It's rather annoying to get notifications on things I don't care about while not getting alerts on things I want. I'm including a picture for details.