If you're using your greatbow for Elden Ring Runes just general exploration, you don't want to burn through your top-tier ammunition, just head to the Hermikt Merchant or Nomadic Merchant and buy Great Arrows, they sell an unlimited supply. We would recommend using these in non-boss situations.

Melee Weapon Giant Crusher

Now as a barbarian with so much strength, we would recommend picking up the Giant Crusher - it's the highest AR weapon in Elden Ring and it skills incredibly well with the build that we're already using. This weapon is just ground loot, all you need to do is defeat the Ulcerated Tree Spirit that's guarding it.

Ashes of War

For melee weapons, use whatever Ash of War skill you want, but for bows there are some that we specifically recommend:

Through and Through - This is the most important ash of war for this build - arrows will pass through all enemies, particularly effective against large Bosses hitting multiple times as it passes through.

Rain of Arrows - Greates a large shower of arrows from the sky, even more, effective with cheap Elden Ring Items Golem's Greatarrows' AOE.