I have new things to add since my last suggestion. Silvar Morgan Rosalia's suggestions
I reinsist for the amber to be a new ressource for the game because it could add many things based on it to the game. + fishing shark and big fish underwater in dagon area with javelin could be very good as a pictish shark tribe but not only…
The game really need dusty clothes, dusty hair, scars etc…
New add to the list: Mammoth Hut/Camp. Add Mammoth furr as ressource and Mammoth bones… And we have all we need for it. So just type it in a research motor and watch what it look like 
Pretty thing isn’t it?