Adjust audience targeting, expand bids, and increase frequency caps on low performing line items to optimize delivery and performance in Amazon Ads campaigns.

• Adjust audience solutions, and increase bids and frequency caps for the line item
• Increase bids, frequency caps, or adjust 3rd party pre-bid filtering
• Adjust audience solutions, and expand bids and frequency to sell out top performing lines

The correct answer is: Adjust audience solutions, and expand bids and frequency to sell out top performing lines

Explanation: If a line item has both low performance and low delivery, you need to broaden its reach and improve its potential. To do this, adjust audience solutions—try targeting broader or new audience segments, and expand your bids and frequency caps. This may help your ads be seen by more potential customers while enabling top performing lines to deliver fully, selling out allocated inventory and driving both performance and delivery up. Continually review and test new audiences, increase bids where appropriate, and raise frequency caps so your ads can reach consumers often enough to make an impact.

Reference: https://advertising.amazon.com/help/GJHF6GB7WZUMPYJ6