Go home and sleep to progress the storyline and unlock new scenes.
Here is a comprehensive write-up designed to be a "better" guide—focusing on efficiency, skill priorities, and advanced mechanics. giantess of abyss guide better
The Giantess of the Abyss is a late-game monster. While she can be fragile in the early stages, her scaling is absurd. She excels at shredding high-armor tanks and clearing waves instantly. The goal of this guide is to transition you from a passive farmer into an unstoppable siege engine that forces the enemy team to surrender or die. Go home and sleep to progress the storyline