Right now I'm trying to farm for the Crimson Key Mold for Vampire Knives. It is really annoying. On the plus side, I can distract myself by killing Plantera in search for the Axe.
I made an ocean into Crimsand. The benefit of this is that spawn rates in oceans seem to be really high and enemies will spawn on screen, allowing you to see drops. Furthermore, I am getting loads and loads of pirate maps, which I will need if I want to get all of the pirate items.