How can I grow a good pop campaign without losing profit?

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To grow a pop campaign and still make profit, it's better to test one change at a time. For example, you can try adding more traffic sources or increasing your bid slowly. It’s also good to pause any placements that don’t convert and move more budget to the ones that bring results. Don’t rush to scale too wide too fast. Track everything and check if your profit is still stable before going bigger. What are some steps others take to grow their campaigns without hurting returns?