Oil, lots of it. Soak it in oil olive oil, jojoba, whatever clean oil you have. Then brush from the tips while it's oiled, gently, over a sink. Finish with clarifying shampoo, use it at least twice and massage through hair to the count of 30 both times.
Then gently brush again and add a small amount of a leave in moisturiser/conditioner.
From then, wash three times per week.
Bond treatment shampoo one day per week, wash twice, count to 30, small amount of leave in conditioner afterwards
Standard shampoo one day per week, wash twice, count to 30, small amount of leave in conditioner afterwards.
Oil treatment followed by clarifying shampoo one day per week, wash twice, count to 30, small amount of leave in conditioner afterwards.
My hair is very fine and flyaway and below shoulder length, and I do this, plus layers lift the curls and make it fuller.
I also never dry my hair with heat and I no longer use dye as it is too harsh, I use Scharzkopff wash in wash out, means I have to do it every couple of weeks, but that's fine, and occasionally it starts to show grey, but meh, don't really care.