Answer:
If a keyword has low search volume in a campaign, the best strategy is to
discontinue using the keyword in the campaign
Explanation:
Discontinuing the use of the keyword with low search volume will help to find a replacement keyword that is more attractive, broader, or more specific. A keyword can be removed, changed, or updated as the case may be when its search volume is low. A good keyword increases search traffic as the keyword triggers ads to appear for the end-user.