Help with increasing QS.

I started a new Adwords campaign for call-only ads and for most of my main keywords I get the status "Rarely shown due to low quality score". When I look at the quality scores I see they are all 1 or 2. I did not expect quality scores of 6 or 7 right from the start, but I also did not expect them this low.

I'm not really sure what the best approach would be to improve my quality scores, so I am looking for some advice. Here is some more info:

Status: Rarely shown due to low…

Help with increasing QS.