When it comes to describing a positive outcome or result, there are several synonyms you can use instead of 'to good effect.' Some of the most commonly used include 'positively,' 'effectively,' 'successfully,' 'fruitfully,' 'advantageously,' 'usefully,' and 'efficiently.' These synonyms all convey the idea that something has been performed or achieved with a positive outcome, but they each have their own subtle nuances. For example, 'positively' emphasizes the affirmative nature of the result, while 'efficiently' suggests that the task was completed in an organized and streamlined manner. Regardless of which synonym you choose, each one can help you to express the idea of achieving a favorable result in a different way.