If I found myself stranded on an island with three other people after a shipwreck, the first thing I’d do is:
Ensure everyone is safe and tended to — check for injuries, offer reassurance, and make sure we’re all out of immediate danger (like rising water or harsh weather). Then, I’d suggest we take stock of what we have: any supplies that washed ashore, skills in the group (medical, survival, navigation), and fresh water sources.
Survival starts with calmness, cooperation, and a clear plan. After that, finding drinkable water and shelter would be the next priorities.
Try to find resources to build a boat so that we could leave that Island. Well, if there weren’t any resources then only other thing to do is get into survival mode and go in search of things to build a hut to live in and also search for food that we can eat if at all possible.
Sounds like a great plan jacqueline,
That’s sounds awhile to thought out plan.
Stay together and explore.
Start a fire, who can start a fire without matches? Hopefully, the other two I am with know how to do this. Maybe, someone will see our fire. Meanwhile, start collecting anything that could help us make a shelter plus anything that could be eaten. Hopefully, some berries, bananas or coconuts❣ I don’t like fish.

It sounds like you was once a navy seal are something, great plan fam.