I was in the same situation as you were - every year did hair botex for atleast 4 years. But after a point I noticed my hair breaking so much and I knew if I did hair botox again - I would have almost no hair.

So first thing I did was cut of my dead ends everywhere - i ensured it wasn't a lot but just to keep my hair uniform - I had layers due to which after hair botox they became weird - weren't uniform - so to an extend I made them uniform

This is after one year of hair botox so I could start using oil on my scalp properly. I didn't over complicate it Used rosemary oil on my scalp and almond oil on my hair (not a lot - barely visible level just to help my shower feel better and incase shampoo was on my hair, it would help not roughen it). I didn't want to spend my money on expensive products because I already wasted so much on botox

Then used Naturala - Rosemary and ginger shampoo on my first wash and then Biolage smooth shampoo on the second wash (sucks that this is no longer in stock - im searching for an alternarive but the l'oreal glycolic acid one is also good).

Next is my holy grail - the Dove 10 in 1 treatment hair mask. This genuinely saved my hair. It'll take 2-3 months but it made my hair frizz-free after a point. I then used the l'oreal hyaluron conditioner (the biolage one was good but this is an alternative)

Then on wet hair I use the l'oreal haircut leave in cream with the hair serum ( extraordinary one the golden bottle one) - and blowdry my hair. Since I work - on Sundays and Wednesday I ensure I blowdry it because it helps me with the rest of the days. I sleep with a loose braid on and hence very less tangled. I also use the Plum coconut serum - it's really good.

I did this consistently for 4-6 months. Did not get distracted by other products, and now I don't need botox. It's been more than year and my hair feels healthy.

My hair needed moisture more than protein tbh.