Applying product upside/a bit of diffusing upside down helps with volume. My hair is on the thin side of medium density, so check out my sig below for product recs. Please keep in mind, my porosity differs from yours, but its worth a shot!
3B, Fine, Med D, Norm P&E
LowP: Kinky Curly Come Clean (50% EVOO)
NoP: As I Am CC
RO: Suave Tropical Coconut/VO5 Shea Cashmere
LI: KCKT/ CJBCLI/HETT/HENOYF (mixed w/ GSO)