The antonyms for the phrase "doest one thing" include "diversify," "multitask," "vary," and "alternate." When we say "doest one thing," it means focusing on accomplishing a single task or activity. However, diversifying means engaging in different types of work or activities, multitasking refers to handling several tasks at the same time, and varying means changing or modifying one's approach or methods. Alternating, on the other hand, involves alternating between distinct and different tasks or activities. When we are open to different approaches, we can achieve more, accomplish goals faster, and keep ourselves from getting bored or stagnant.