"Back at sea" is a phrase used to describe an individual who has started something over again or is about to begin a new journey. Synonyms for this phrase include "starting anew," "beginning fresh," "recommencing," "resuming," "launching again," and "embarking on a new journey." These synonyms are appropriate in various situations such as when someone is starting a new business, enrolling in a new school, or beginning a new relationship. Regardless of the context, these words all suggest a fresh start and the sense of adventure that comes with starting a new journey.