"Struggled along" can be replaced by several antonyms, depending on the context. An antonym of "struggled" would be "flourished," which means to thrive or be successful. Instead of struggling along, one can also "prosper," "advance," "succeed," or "proceed with ease." Other antonyms that could be used are "glided," "coasted," and "cruised." These words suggest an effortless and smooth journey, a stark contrast to struggling. The antonyms of "struggled along" indicate progress, advancement, and successful growth, which can be applied in different situations, such as personal growth, career development or business ventures.