Unlimited Production Machines + New Production Machines + Selling Lures, Traps, Nets
When you reach a certain level, you find that you need more of one item than you can produce. Such as dairy and sugar, the majority of the items we can make need one either sugar or dairy, and having only one of each is not convenient at all. I think we should be able to buy unlimited production machines but the price for each one would rise depending on how many you own. I don't think that it will become overpowered as have a limited amount of space, even when you expand.
My next suggestion is that we can take dead trees and or bushes and turn them into lumber. This lumber can then be used to make planks, panels, axes, etc. Say for panels you would need 2 lumber and a screw. For axes and saws you would need iron or silver along with lumber.
My last suggestion is that we should be able to sell fishing lures, traps, and nets.
Let me know if you like an idea or if you think something should be changed!