Seal with what?
You don't necessarily need to go mad on anti humectants, you don't need to veer from one extreme to other other. First of all cut back on the humectants - your GVP has propylene glycol, you are adding honey, glycerin in your stylers and aloe vera in your daily conditioner. It's just not balanced.
Then perhaps add in some film formers - flaxseed gel, okra gel, hydrolysed protein, panthenol are all options. You can also make a basic gel more sealing by adding oil - see the DIY Ecostyler custard recipes.
Suave Naturals coconut contains glycerin and propylene glycol but down the list I think, it's not really humectant nor anti humectant, overall more emollient.
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