"On one's game" is a phrase used to describe someone who is performing at their best, fully focused and in their element. There are many synonyms for this phrase that can be used in different contexts, such as "on point," "in top form," "at the top of one's game," or "in the zone." These expressions can all be used to describe someone who is confident, alert, and performing at their peak, whether it be in sports, work, academics, or any other field. By using these synonyms, we can effectively convey the message that someone is fully engaged and at their best, and this can have a positive impact on their performance and success.