To increase a campaigns performance you can create a segment of bot traffic to negatively target in DFP.
To begin, you'll need to create a new segment in the Permutive dashboard. Call the new segment something appropriate (e.g. 'Bot Traffic'). In the Behaviour section set 'Pageview was performed' with all of the following properties: client.user_agent contains [list of bots]. Please see properties below as an example of common bot traffic.
Save the segment, send as a reaction into DFP and use it during campaigns to optimise their performance.