Youre goiing to have to learn from Native American strategies in areas like montana. Theres a reason why cattle rearing is still done there, you have to survive off things like grass which you can only readily do if you use ruminants as an intermediate. They can provide oils through butter and suet, wool if you use goats or alpacas, or leather otherwise. Learn from the people that came before us, we are their inheritors whether we like it or not.