Para minimizar el número de valores que aparecen como NULL debido a los umbrales de agregación, puedes:

Expanding any filtering in your query is the correct approach because it increases the number of rows considered, making it more likely that each group will meet the aggregation threshold. When a group doesn't meet the minimum number of records required for aggregation (due to privacy thresholds), its values appear as NULL. By broadening your filters, you include more data, which helps groups reach the necessary size. Using more granular dimensions in your GROUP BY clause would likely increase the number of NULLs, as it creates smaller groups that are less likely to meet the threshold. Reducing the query's time range would also decrease the data volume, leading to more NULLs. Observing dimensions in combination rather than isolation is a good practice for analysis but doesn't directly address the issue of aggregation thresholds causing NULLs in the same way as expanding filters.