To keep your characters and weapons upgraded, efficient farming of rupees, experience, and materials is essential. Rupees: Replay missions with high rupee rewards, especially those with 'Defeat all enemies' objectives. Equip weapons with 'Rupee Drop Rate Up' seals. Selling excess low-level weapons after fusing their experience can also generate significant income.
Experience: Replay challenges that offer high experience rewards. Use meals that boost experience gain. The Training Camp is also a quick way to level up characters, though it costs rupees. Materials: Target specific missions where the desired materials drop frequently. For example, if you need Lizalfos Talons, replay missions with many Lizalfos. Equip weapons with 'Material Drop Rate Up' seals. Always check the mission rewards before starting.