Island Survival Game

Blue Star is destroyed. Yu Lang woke up and found himself on an endless sea. At his feet was a 4-square-meter raft, floating with the waves. "Ding! The system is activated, welcome to the new world. New human Yu Lang, please work hard to survive and develop, there are more surprises waiting for you..." "Ding! Congratulations on getting the lottery system! You got it..." How to survive with empty hands at the beginning?