Hi! I want to start taking care of my hair but I don’t know where to start!

To make it short, I have naturally dark brown hair and slightly wavy hair. I previously bleached it had colored hair and I’ve put dark brown box dye about a month ago. I don’t want to changed it anymore! I love my natural look.

I feel like my hair is thinning and doesn’t grow as much anymore.

I was wondering what I should use to help!
I saw k18 and bondi boost! I did my research but I’m still not quite sure which one is better for me.

For now my hair products are
-L’Oréal glycolic shampoo conditioner gloss and the hair oil
(I don’t see difference with the shampoo and the conditioner but I do really like the gloss and the oil)
- my hair mask is shea moisture deep conditioning and I also have the leave in conditioner.

And for my scalp I have the ordinary hair serum and I use the salicylic toner from the same brand.

I want something that will help with hair growth and hair thinning!

What should I do??

Edit: I RARELY use heat. Maybe 1 or twice per year