Lowering the frequency of a sung note

if I lower the frequency of a note sung by a male voice, let’s say by a few tones, the voice “widens” in a monstrous way. Is there a way to preserve the timbre of the starting voice as much as possible?
Maybe applying some plugin later?
(The problem is also the opposite: if I raise the pitch a few tones, the voice becomes almost ridiculous).
Thank you,

Melodyne (not free) has some “tricks” for dealing with that but I’m not sure how far you can push-it.

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