Build a schooner, and tons of explosive barrel. Take 2-6 of your friends. Wait for enemy to mostly go offline (weekdays 4AM -7AM). Go near their port (stop in a safe distance cuz they have good defense against ships). Find the weak spots. Mostly sneak in underwater, and fck all of their ships. If u have time, demolish all of the sunken ships, and drop out the loot (if u like something keep it), u can fck them more like this. Be proud of your skills, they don't had a chance, u'r a genius strategist :).
Laugh if the "online enemies (maximum 1-3 players)" coming to you, they can't shoot u cuz of lags.
95% of fights looks like this these days.
They Cry, u Laugh, and that's all :)