When looking for alternatives to the phrase "more lighthearted", there are several synonyms that can convey a similar sentiment. One such option is "carefree", which suggests a joyful and relaxed state of mind. "Cheerful" depicts a bright and optimistic demeanor, while "playful" emphasizes a sense of enjoyment and fun. Another synonym is "whimsical", which conveys a light and fanciful quality. Additionally, "merry" invokes a sense of happiness and mirth. Choosing any of these synonyms can effectively capture the essence of being more lighthearted, providing a range of options to express a cheerful and carefree disposition.