Storage Capacity is increased by Building Houses. Residences and Huts (respective living Quarters for each Race)
You can also Increase it by doing Research in your Main Hall
ps if everything fails build some Carts, Treants or whatever unit can carry ressources and position an Army on the World Map to bunker the stuff there
In the Shadow of the Black Cross. We Fullfill our Duty in your Name.
And Look forward to the Day we Return to your side Silvanos.
Watching over our Comrades as they Fullfill their Duty in your Name.