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In fact, there is no trick to triple it, only two or three tips on this subject:
1. The raw material of the workshop you opened is abundant in that city.
For example: If you are going to open a tannery, there must be plenty of leather in that city.
Option 2: It is possible to increase production by 20% by opening the Proxy --> Colony in the skill tree.
3- If there are the same workshops in nearby cities, buy them and exchange them.