So my entire idea is based off the fact that sometimes I have waaaaaay too much food gold or ore, so what if you added a trading hall building of sorts that you could trade 2:1 ratio your current resource to get something else instead that way you would get more benefit out of the resources instead of just being 50m OC on food
All of the resources will eventually be needed at higher levels when things get ridiculously expensive. But, for players who have yet to reach that point I think that idea is pretty cool! My advice would be to see if anyone in your realm would like to trade, with good tax research you'd actually get better than a 2:1 this way