Curl confusion and diffusion

I'd avoid that hairdryer (except for emergency use) and just go with the flow. Frizz is annoying (especially on my poker straight locks) so I use less bicarb (shampoo substitute) and only lukewarm water - wash gently, not thoroughly - with a diluted vinegar rinse to calm things down.

Having had very curly hair all my life.....
Get a good cut.
Wash every other day and spray/soak hair the alternate day.
Use serum or argon oil (not too much) on wet hair and comb through.
Lean forward and give your hair a good shake.
Leave to dry naturally- don't let a diffuser or hair dryer anywhere near it!

Frizz Ease have lots of products for curly hair including one called Secret Agent which reduces frizz immediately when applied to dry hair. Other products for curly hair are available!

"Aveda Curl Enhancer" A 1 inch round blob rubbed through wet hair, left on and dry with diffuser hair drier or just let it dry naturally. . Its excellent

I find using pure shampoos, without chemical and Waitrose Pure conditioner helps. As previously said a little Argan oil spread on fingers through the damp hair helps.
I prefer mine to be straighter so I use a hot air styling brush on very low heat.