If you're itching to put on a new suit of Nether armor, dig in Nether, because you'll need to find a lot of ancient fragments.

This is one of the newest minerals in my world and can be smelted to produce a Nitrite scrap. Combine 4 shards with 4 gold ingots to get 1 Gold Nugget and start upgrading your diamond tool. Ancient fragments may be rare, but they're worth it. Try to find your best luck around Y-Level 15.