Is something skipped after "maybe that's something"? "Something" is not specified so it seems like incomplete. Or is "that's something" itself an idiom? Then, what does that mean?
No, nothing has been omitted from "maybe that's something." It is not an idiom, and is just Ariana Grande expressing her personal thoughts. Note that just before, she says "but I don't know." "Maybe that's something" is a continuation of that idea, and is deliberately vague and ambiguous for that reason. Note that "maybe that's something" is sometimes to mean something similar to "maybe that's meaningful." Thus, we can understand Ariana as saying that she's not sure, but maybe it's meaningful or significant in some way. Ex: I feel like I'm letting go of old grudges. Maybe that's something. Am I growing up? Ex: During quarantine, I've been feeling like I need to take on a challenge. Like learning a new language. Maybe that's something.
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