Need help to straighten my hair durably 👩‍🦱

Hi everybody 👋

As you can see on the 1st picture, I have real afro hair and I would like to have them straight like on the 2nd pictures but for more than a week. I need to find a way that keep them straight even after a shampoo !

Me and my hair it's a long story. I don't have any one around me with same hair, so I have never had any keys to take care of them. For years I have used hair relaxer (see 3rd pic) : until I have started to loose my hair (half my lenght). My hair where short up my ears, at 12 years old can you imagine 😢

Since then, so it's been 15 years, I am using bundles hair every 3 months, and braids twice a year.

But now I want to keep my real hair, I am fed up of hiding them. However I can't keep them natural because it's hard to style and I am not ready for it, for now.

On the 2nd picture I had tried botox or caviar straightening (I have tried both but can't remember wich one on this pic). I have never tried other straightening treatment (such as Brasilian ...).

I need you to help me find a routine with my hair to have them straight, and strong please 🙏 I am open to every advices, every tips, every products, brands, way to do ...

Hoping to have feedbacks Thanks in advance 🫶

PS : I am french so sorry for the writting 🫠