A Lone Ship in Guyun

In order to get this quest, you will have to go to the ship by gliding there, or by swimming (or Kaeya with ice bridge). Once you're there, one of the npc will stop you and the quest will start. Important note: you will be asked for 3 meats, and a starconch, so make sure you have them before going to the ship so you don't have to go back and forth multiple times. You can get a starconch around the beach area near the water.

When the quest starts, you will be asked to talk to several npc's, but only some of them needed some actual help.

Juza needs 3 pieces of meat. This one is pretty easy to get since most wild animals will drop some meat, and you also have 3 different choices of meat too.

Then talk to Little Yue where he will ask for a starconch, and wants you to deliver it to someone in Liyue Harbor. Don't teleport there right away though, since there is no teleport waypoint back to the ship, and there is 1 more npc that you should talk to before that.

Talk to Yinxing where she will then give you an item to give to an npc also in Liyue Harbor. You can teleport to Liyue Harbor to hand in the two items then head back to the ship again. Once you're done with all 3 tasks, you might need to talk to the other crewmates, if not then talk to Juza again to finish the quest.