I don't have the answer that you're looking for but would you consider working with a voice teacher? I'm an actress and when I take intensives we always work with a voice teacher before the acting teacher will come near us

and oh it works woooonders!
I would send you some of the exercises I've been taught but I don't think they'll help you as they're meant to bring your voice down to your natural voice register - which yes, unfortunately tends to be much lower for both men and women... I always feel self conscious once I finish the class because I think I sound like a beast afterward

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Anywho I do think that you could benefit from a session or two with a voice teacher since you could always use the exercises on your own in the future.
Good Luck!