To get more Legendary Caches or other powerful loot, you’ll need to Diablo 4 Gold continue progressing through the Seasonal content, such as:

Complete Additional Rituals: After completing "Poison in the Roots", you can continue unlocking other rituals and activities tied to Witchcraft powers to earn more rewards.

Grim Favors: By gathering Grim Favors and completing Seasonal Bounties, you can progress in the Seasonal story and unlock new Witchcraft powers, which may grant you more caches and valuable items.
Defeat More Enemies: Continue slaying Headrotten enemies, completing seasonal objectives, and fighting World Bosses to collect additional Legendary loot from caches and other rewards.

5. Maximize Cache Rewards with Seasonal Progression
The more you progress through Season 7, the better your chances of obtaining Legendary Cache rewards. As you unlock more powerful Witchcraft abilities, you’ll increase your capacity to take on tougher enemies and more difficult tasks, resulting in higher-tier loot from Legendary Caches.

Summary: How to Earn Legendary Cache Rewards
Complete the "Poison in the Roots" quest, including the ritual and enemy defense.
Receive the Legendary Cache as a reward for completing the quest.
Open the Legendary Cache to gain Legendary gear and other valuable items.
Progress further in the Seasonal content by continuing to complete quests, rituals, and defeat enemies to Diablo 4 Gold for sale earn more Legendary rewards.