My suggestion is to add a new but separate system it works like a treaty/pact. Kings are the only one to be able to work this system.
It allows a source of political power within the world of Pirates Glory resulting in less wars and loss of new player base.
Okay so say spain were to make a peace treaty/pact with china which allows both trade and non aggressive actions between ports of which the kings own. So yes things would be fine and dandy and really no result of wars being waged as that would prove to be a problem in this suggestion, because war is fun. However!!! By simply adding another option to pacts/treaties which would be a Trading Pact/Treaty from this option the king of the ports may decide whether or not to allow trade with another king and there ports. With that in mind it allows the power groups to work as a flow rather then a destabilizer, if they want things to run smoothly for a period of time or so.
Now to another fun part that this Trading pact/treaty suggestion may add, is the fun of this being a pirates world also. So say a trader under one king is lit from a raider under another nation, everything remains the same as without the treaty/pact system until, the raider from the nation who is attacking the trader from which there is a trading pact/treaty between the 2 nations which will result in the raider gaining let say for example +10 in hostility towards targeted nation. Actually now that i think about it, this should also fall under the idea for the peace treaty/pacts which of course tho will result in higher hostility as it is a time of peace and not trade.
Through this new system alot of fun and new strategies to gain a higher playerbase may result in a success.
Any and all suggestion or ideas are welcomed.