Right, so i played against this dude too lol.
I didn’t even need a lot of special strategies, i just cleared one side of the lake with culverin to setup my docks, built full navy, and then swarmed his defenses in one place. He couldn’t kill all my transports so when i landed my cannons it was GG. The key is to attack with all your ships. They are too many to deal with rapidly.
Also the native canoes were pretty useful since they are easy to rebuild and useful for tanking shots.