

Frizzy long hair, what should I do apart from straightening?
Hi! I have no Idea what should I do with my hair... I don't have much money (I'm an uni student) and I really want to take care of my hair. Colour is natural so they shouldn't be damaged from any colouring or anything, I only trim the ends at the hairdresser.
The first photo shows my hair after waking up and brushing them. They are all frizzy, even when I use keratin dry conditioner and hair silk. They only thing that helps is straightening with straightener (second photo) but they are still kinda frizzy. I have no idea what to do. I use normal shampoo, conditioner and keratin mask two times a week.
I don't want to damage them with heat but I have to, my job requires good looking, not tied, hair (I'm in customer service where I have to look presentable, at least).
Can anyone help me with them? What kind of routine should I use? I love having long hair but at the same time, it's a nightmare 😭