You are being too vague, what specific products are you using at present? What shampoo and what oils? A simple but effective DIY deep conditioner is your regular conditioner plus honey plus aloe vera plus a penetrating oil like coconut.
Simply solution to styling products feeling horrible, don't run your fingers through your hair or mess about with it! That causes frizz and if done regularly (especially when wet) it mechanically damages hair. If your hair is thick and coarse you will likely need more than a weak spritz, flaxseed gel is not strong hold it's usually used straight up.
For nighttime do a pineapple or loose braid then wear a satin sleeping cap or use a satin pillowcase.
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