"At the end of the line" is a commonly used phrase that indicates the final stage of a process or the last step in a project. However, there are several synonyms for this phrase that can also be used to convey a similar meaning. For instance, "last on the list," "end game," "final destination," "last hurdle," and "final stretch" can all be used to indicate the end of a process. Alternatively, "culmination," "conclusion," "completion," and "finale" are also commonly used terms to convey a similar message. By using these synonyms, you can add variety and enhance the impact of your writing or speech.