Copper and bronze would still be useful for setting up new bases or expanding your current one. They are used for making forges, numerous station upgrades, braziers and sconces, fermenters. Having multiple fermenters is a good idea anyway if you don't do that already.

Tin doesn't have much use on its own. It is only used for making a butchers knife and making more cauldrons. So don't get much more than what you need to make your bronze.

To be honest though, screw bronze. I'm just happy for you that you're pretty much past it.