I have an idea, mmm why not put a trading system, that when fishing find chests, coins, treasures, things etc, that can be used to implement the raft or to exchange it with another shipwrecked merchant.
and I also want to say, that I speak Spanish, so it would be good if the game could also be in Spanish (the second most spoken language in the world), with pleasure I can help you translate, well it's just my opinion.
I hope my idea is helpful, greetings :)