Mine to the Nether
Reach Y-level 15 in the Nether
Bring a diamond or netherite pickaxe
Bring plenty of blocks, food, and a fire resistance potion
Use beds or TNT to blast large areas
Mine ancient debris
Smelt ancient debris into netherite scraps
Combine 4 netherite scraps with 4 gold ingots to make a netherite ingot
Use a smithing table to upgrade diamond gear with netherite ingots