Wavey/curly hair suggestions

So I was born with straight hair but around 28 years old my hair has become wavy. My birth mom said that happened when she turned 30.

However...when I wash it. It's wavey.

When it's dried? Straight A's heck.

But when I just use dry shampoo and oils it's wavey. Again.

I love this sudden volume and wave tho and I want it 24/7 cuz I feel confident and sexy.

No idea what is going on but would like some products you suggest. Thanks 😘