The phrase "am stuck on" often indicates being fixated or obsessed with something. To convey an opposite meaning, one could use antonyms such as "breezing through," "open-minded," or "free-spirited." For instance, instead of saying "I am stuck on this problem," one could say "I am breezing through these assignments." Similarly, instead of saying "I am stuck on this idea," one could say "I am open-minded to exploring different perspectives." Finally, one could use "free-spirited" as an antonym to indicate a sense of independence and lack of fixation. "I am not stuck on any one particular thing - I am a free-spirited person who likes to explore different options.