Change your parting - where your hair normally lies is where it is most flat as it falls there naturally, so next time make sure to swap your parting to add extra volume.
Back brushing – instead of back combing, gently brushing your hair backwards to the roots with a paddle brush can cause volume.
Hair drying upside down – your roots like to dry upside down, off the scalp and so blowing your hair upside down allows them to dry in the position they want.
Hot rollers – they are much easier to use that curling irons and there is no fancy technique that you need to use. Just put them on in the morning and you can let your hair curl while you apply your make up or have your breakfast. 20 minutes later and they are ready!