What is a recommended step to optimize an under performing deal on the SSP side?

The correct answer is Ask the publisher to increase your inventory because when a deal is underperforming on the SSP (Supply-Side Platform) side, one of the most effective steps is to reach out to the publisher to request an increase in available inventory. A lack of inventory can be a key factor contributing to underperformance, as it limits the number of impressions that can be served, thus affecting the campaign’s reach and delivery. By increasing inventory, the campaign has more opportunities to run and deliver ads, improving overall performance. While adjusting targeting or increasing bid rates can also help optimize performance, these actions alone may not address the root cause if inventory is the limiting factor. Therefore, working with the publisher to increase inventory is often the most direct solution.