When it comes to trying one's hardest, there are a multitude of phrases that can be used in place of "one's damndests." Some options include "giving it one's all," "putting in one's best effort," "going the extra mile," "doing one's utmost," "exerting oneself to the fullest," and "pushing oneself to the limit." Each of these phrases conveys a sense of great effort and determination, emphasizing the level of commitment and focus being brought to a task. No matter which phrase is chosen, the message is clear: one is giving everything they've got in pursuit of their goals.