Try a dilute vinegar rinse and/ or protein treatment. I would not use any penetrating oils, that will potentially lock in the hair colour, oils don't moisturise anyway they are anti humectants. Try soaking your hair in the Head & Shoulders not just washing it. If that does not work you may have to suck up having bad hair for a few weeks.
2a-2c, medium texture, porous/ colour treated. Three years CG, growing out mechanical and chemical damage = breakage and very high porosity. Past armpit length heading for waist.
Treatments: Komaza protein, Komaza Matani, coconut oil with sugar syrup. Hairveda Sitrinillah
Leave in: Fructis Sleek & Shine (old), Gliss ultimate volume
Styler: Umberto Giannini jelly, Boots curl creme, Rockin RInglets
Experimenting with: Mega-Tek, Curl Harmony reviver, Elvive Full Restore 5.