As a South Asian, what actually works for dark underarms + how long did it take you to see results?

Hi! I’m trying to lighten my underarms. For context: South Asian, mid-20s, I shave, use clear deodorant, and wear sleeveless tops (as I live in a very humid destination). So this is something I want to improve.

I keep seeing products from places like The Ordinary, Paula's Choice, and Cyklar as the top choices. But I cannot decide which product I should use. So I want to see what everyone thinks about it.

If those who have tried lightning their dark armpits, what actually worked for you, and how long did it take to see results?

Also open to any shaving/irritation tips.