Find the titanium tools blueprint in utopia, right near where olaf takes his tumble. After getting it researched, grab some titanium using metal detectors or check containers in later areas its pretty rare stuff. When crafting arrows youll need titanium ingots plus the usual scrap rope and planks, nice damage boost going from 15 to 20 but consider if its worth the materials right now.

Smart move is getting those quality upgrades sorted first, like better engine controls and advanced anchors before burning titanium on arrows. Combat upgrade is decent, but maybe interesting to know the damage increase isnt massive compared to regular metal arrows considering how precious titanium is. Stock up on the material first, then think about making a bunch of arrows when youve got your main gear sorted and extra titanium laying around.