The phrase "levels off" refers to a stabilization, plateau, or equalization of something that was previously fluctuating, declining, or rising. Antonyms for "levels off" could include words like intensify, escalate, surge, increase, climb, spike, soar, or rocket. These words suggest an upwards direction, a rapid acceleration, or a sudden burst of activity that is opposite in meaning to the idea of leveling off. Alternatively, words like decline, decrease, diminish, shrink, slump, dip, or droop could also be antonyms for "levels off", suggesting a decrease or drop in something that was previously stable or growing.