6… Fake fullness.
There are many ways that stylists suggest that you can use to fake voluminous hair. One of them is color highlights and low lights. Coloring your hair will create an illusion and your thin mane will look fuller, whereas on the other hand uniform color can make hair look flat.
Also, you can try for bouncy waves look. Of course one should go for the damage less method that is you can try clamp-free curling iron.