Serum! What serum are you using? Serum is usually another word for silicone, and silicone can really weigh your hair down.
With hair as fine and thin as yours, I'd suggest using a gentle low-poo, rather than co-washing or no-pooing. A light weight conditioner, like Jessicurl Aloeba would also help. After that, either a mousse or flaxseed gel for styling because those are the most lightweight.
Baby Fine 3B, low porosity, normal density and elasticity
CGing since July 2008