- Create new ad groups with related keywords grouped together
- Remove half of the keywords from the ad group
- Create one ad group for every five keywords
- Create new ad groups with several keyword match types
Explanation: Use ad groups to organize your ads by a common theme. For example, try separating ad groups into the different product or service types you offer.
Read more here: https://support.google.com/adwords/answer/6298?hl=en