• Look at certain dimensions in combination rather than in isolation
• Reduce the time window of the query
• Use more granular dimensions in your final GROUP BY statement
• Broaden any filtering that may be in place on the query

The correct answer is: Broaden any filtering that may be in place on the query

Explanation: To minimize the number of values rendered NULL due to aggregation thresholds in your AMC output, you should broaden any filtering that may be in place on the query. This means reducing the granularity of selected dimensions and extending filters or time ranges to include more records or users.

Reference content: From Amazon’s documentation on aggregation thresholds – AMC aggregation threshold documentation

“If you have too many metrics with NULL dimensions… you will need to make your data less granular to get meaningful insights. Try the following:

• Make any filters less restrictive to include more campaigns, line items, ASINs, etc.”
• Consider extending the time window of the query.
• If you are selecting the day in your final output, consider selecting a two-day period or a week.
• If you are selecting an hour in your final output, consider selecting a 4- or 6-hour window.
• If you are selecting a line item, consider selecting a campaign instead.