Re-read your post, you didn't list products in most cases you listed brands!
"Shea Moisture - which one?
L’Oreal EverCurl - which one?
Giovanni - which one?
Kinky Curly Knot (hate the smell of it)
And ½ bottle of Curl Junkie Cleansing Cream.
JessiCurl - which one?
MiraCurl Curling Gelly
Don't bother with olive oil, given the level of damage just use the coconut oil. Oleic acid can certainly penetrate, but it's lauric acid that is proven to preserve structural proteins which you desperately need at present. If you are on a budget I would concentrate on making or doctoring your own products, there are only a very limited number of ingredients that will make a significant difference by penetrating or adhering in such a way as to strengthen the hair.
I *think* Sally's has the 'As I Am' line some or all of which are pH 4.5 or thereabouts, but they may be too heavy for your hair type. Also the 'Stay on Satin' line of sleep bonnets: I assume you can return them if they don't stay on as promised but YouTubers say they do. Do get a satin pillowcase otherwise, hopefully someone can tell you the cheapest place since I am not in the US.
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