I normally play Sometime Ago in F, but if we keep it in C as you have it, here are a few suggestions you could consider:

Bar 14, G7sus/F
Bar 21, D13
Bar 24, G7(b9)
Bar 38, G7(b9)
Bar 39, Bb7(#11)
Bar 42 add /B
Bar 43, Cm11
Bar 46 Eb9


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