I have put up a set of ads advertising travel in Nepal. I added a number of keywords that have to do with various things you can do in Nepal as well as famous things to see there. I also added all of the negative keywords that I thought may interfere with the search, but there aren't many (eg. if I put Annapurna Trek as a keyword, there aren't many negative keywords that would be needed). Still, my CTR is below 1%. Does anybody have any ideas? Thanks a lot!