The opposite of the phrase "dialed back" would be "increased" or "amped up." These two antonyms suggest an increase in intensity or effort. Another antonym could be "escalated," which indicates an increase in severity or importance. Conversely, "scaled down" or "reduced" could also serve as antonyms to "dialed back," suggesting a decrease in intensity or effort. "Diminished" and "lowered" can also refer to a reduced level, particularly in volume or energy. Essentially, any word that describes an increase or decrease in intensity, effort, or severity can serve as an antonym to "dialed back.