Hair loss concerns

My hair is wavy and it looks like I have a lot of volume.

Actually, I don't think I have a lot of hair, especially on the crown area.

It's getting wider and wider day by day.

I often tie my hair, but I do it loosely without making it tight.

I don't think it's because of this, but it's good for gradually starting hair loss.

Are there things like shampoo or food?