Most Helpful Girl
I have really straight, sleek Asian hair and the only thing that helped my hair look more voluminous is perming it, or putting taylor swift-like waves in it. I get tons of compliments too when I do them.
Otherwise you could try those volumizing sprays, just spray them on the roots and then toussle it up a little bit. And don't use a moisturizing shampoo. Conditioner also makes your hair look more sleek, so only use it on the ends.