The phrase "putting double whammy on" implies causing two negative effects or consequences. Therefore, some antonyms for this phrase may include "mitigating the impact," "improving the situation," "lessening the blow," "promoting positive outcomes," and "reversing the damage." The opposite of adding a double whammy would be to bring or create a double benefit, double reward, or double blessing. In other words, the reverse of adding two negative impacts would be to add two positive results. This could include offering help, providing support, or implementing strategies to improve a situation rather than exacerbating it.