There are several synonyms that can be used to convey the meaning of "as if your life depends on it". Some of these include "with utmost urgency", "with unwavering determination", "with absolute dedication", "with complete zeal", "with fervor", and "with all your might". These phrases all suggest a sense of urgency and importance, implying that the task at hand is crucial and must be approached with utmost dedication and effort. Using these synonyms can help to emphasize the importance of the task and convey a sense of urgency or intensity, motivating people to act with increased focus and drive.