Finally donated the last artifact to the museum in winter of year 4. There's always something that takes me two or three years to find. I may be the only person who routinely gets master craftsman and master chef before completing the museum.
I did some save scumming to see what enchantments I can get on my tools and weapons. If I pull it off correctly, I should be able to get a powerful pickaxe, a bottomless watering can, a master advanced iridium rod, vampiric, and haymaker. At this point, I am leaning toward vampiric galaxy sword and haymaker dwarf sword (I have to make a grasscutter blade on every save now, it's just too funny not to). I may set up a skull cavern run with vampiric, a fairy (I only have a level 2, not sure if I should burn through some iridium and try for a better one), slime charmer, and carry the holy blade for finishing off mummies.