I'm better than I was the last time, crescendo
Crescendo is a musical term that describes sound getting progressively louder. This is most likely a metaphor for Chance growing as an artist — having started off small and gradually developing his skills and increasing popularity.
His use of “crescendo” could also be referring to how the line was also used in the intro, showing how the album grew.
Finally, the way Chance raps “I’m better than I was the last tiiiiiime” is literally demonstrating a crescendo.
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