Whats the best way to repair severely bleach damaged hair without cutting it?

I asked kgb what was the best bleach to use that wouldn't damage my hair at all and they suggested I use 'Beyond the Zone on/off scalp radical bleach kit' I looked up the reviews online and everyone who used it said it got even dyed black hair perfectly blonde in one use, and that there was NO damage. However, I recently had my hair chemically straightened. When my hair is wet it feels like spagetti and its SO sticky and brittle I can't even run my fingers through it, but when its dry and straight its perectly soft and shiney but its dry and frizzy. Kgb says H2 Ion thermal activated hair repair is the best way to repair fried damaged hair but its 80$!! No freaking way! I'm NOT cutting my hair every time I cut my hair I regret it so there's NO WAY I am cutting it. Please please help!! I've heard amazing things about john frieda full repair but idk how well it'd work on bleach damaged hair, and 'Wen hair care' looks great but same problem, no idea how it would work on bleach damage.