Having dyed my hair in cool reds for perhaps a decade .... Do not 'refresh' the lengths with permanent or demi permanent dye, over time this causes damage making the ends more porous worsening the chances of a mismatch between the older and younger hair. Use a peroxide free semi permanent on the lengths.
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.
CO-wash: Inecto coconut
Treatments: Komaza Matani, coconut oil, Hairveda Sitrinillah
Leave in: Fructis Sleek & Shine (old), Gliss ultimate volume, Inecto argan
Styler: Umberto Giannini jelly, Boots Essentials gel
Experimenting with: going back to basics