There are various synonyms for the term "improve mood." One of the most common is "enhance mood," meaning to make one's mood better in quality or intensity. Another synonym is "boost mood," which implies an increase in the level of positivity in one's emotional state. "Elevate mood" is another synonym that suggests uplifting or giving a sense of elation. "Lift mood" means to remove the negative emotions and replace them with positive ones. Lastly, "brighten mood" signifies a change in the mood by making it more lively and joyful. Using these synonyms can help one express themselves better when discussing mental health and wellbeing.