0

On some days she is pretty lethargic; otherwise, she is super energetic.

Vs

Some days she is pretty lethargic; otherwise, she is super energetic.

Is preposition on necessary?

1

On really is only kinda-sorta needed if the pattern in the sentence is "On {X} {Y], on {X} {Z}" or similar.

On some days she is pretty lethargic, on some other days she is super energetic.

It's worse to only use 1 on in the pattern above than using 0 or 2.

  • I think it would be helpful to emphasize that you also expanded the parallel structure she already had by changing otherwise to "[some] other days". I think that is the most important part to make the sentence more readable. – katatahito Jun 21 '19 at 8:04

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