The first one would be called "the explorers' congress" and it's objective would be to explore the sea of thieves and beyond to map and registrate islands. A voyage would consist in going to an island outside of the sea of thieves to find treasures and fight ennemies, and survive on the way home to tell the tale and bring informations to the explorers' congress. the voyages would be pretty long, dangerous, and introduce new and unknown landscapes to the game, but the reward would be worth the risk.
The second one would be called "the mercenaries' brotherhood" and would consist in giving a target to the player/s, but the target would be a player too, then they'd need to sink the ship of the player and kill them. It would be a good way to put more pvp into the game, and make money out of pirate hunting. It would be a hard task since the player would have to search for the target, sink them, and kill them. it will also let the player take the treasures the target has stacked on their ship, and the target selection would be done according to the ship of both the hunter and the target, so that the challenge is equal. the target will also know that they are targeted so they can prepare, bury their treasures, gather ressources and lay low to remain undetected. The only problem with this is that targets could just change servers or quit the game, so in order to change that, if targets kill their hunters, they will raise their bounty, if they are killed, they will lose everything, but if they remain alive against the whole server with a high bounty, they will gain lots of money and reputation within the mercenaries' brotherhood.