Definitely cut out the damage, be sure your protein is hydrolysed so it absorbs and don't overdo protein. Coconut oil is wonderful for damaged and porous hair.
Try a gel containing a fair amount of humectants like propylene glycol, assuming you are in the right climate for that - maybe Curl Keeper - or even a curl cream or make an Ecostyler custard with any gel plus a little oil (see YouTube). Mousse is often not enough to 'glue together' damaged strands to make clumps.
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