why don't you try a sulfate free shampoo to give your hair volume ?
i have curly fine hair so i like to use a gentle shampoo. but make sure the ingredient used to clean the hair is safe . if your going to use the sulfate free shampoo and still wants to use your regular hair products .. you can!

watch the last video for waterlily716 she explained everything

Curly Girl Video Addendum - Silicones, Sulfates, & Solubility - YouTube

also first time you get into CG routine you can go with over moisturizing your hair but once your hair become healthy and less dry you should moisturize your hair less and use a light conditioner

+ good haircut + mousse is lighter on the hair it's going to give you more volume than using gel