New Player Question: How do I get more steel?

Hi folks,

As the title says, I'm new to the game and have been trying out a few different scenarios before I finally stuck with one that I've really enjoyed. I'm running the Lost Tribe scenario, and I've found the additional challenge of starting with neolithic technology really fun!

However... I've recently reached the stage where my tribe has reached medieval tech and they're armed with plate armor and long blades. My starting area spawned with ridiculously little steel, but we've got plenty of animals and fertile soil.

How can I get more steel? Every time ship chunks crash, I go and deconstruct them, but I can't just keep waiting for trade caravans to hopefully show up... :(