There are following method and you can used to and reduced campaign cost in below list:
- This is a metric to determine how relevant and useful your ad to the user
- CTR Relevance and overall quality of landing page
- Landing page must have relevant and original content
- Easy to navigate and user friendly
- Be transparent about nature of business or products.
- How you are going to use user’s contact and personal information
- Relevance like Location, language, demographics etc.
Ad formats-
Yes, the type of ads that Google find
relevant to the user’s search query or placements on GDN. The higher ad
extensions to your text ads, the more
impact will it have.