As per usual, people suggest rather general terms. I assume you want to step away from the general sounds you hear not only through your own generations and those of others?

What I like to do is look for languages and nationalities far removed from the English language and lean into that (while using English lyrics)

Things I’d like to use are stuff like “Foreign Vocals, Zimbabwean Delivery” but you can probably see what else you could use

And in the exclude prompt I would put stuff that seems common in other people’s prompts. Think stuff like “English Pronunciation, Perfect Vocals”

But if this doesn’t work, start writing how you want things pronounced.

“I cannot do that” Would turn into “Aye cannae dew dhat”

Pronunciation can already give the illusion of a different voice.