The "Chapter 7 grind" is a common hurdle. Steam Community discussions suggest a much faster method than manual exploration:
Her high rate of fire and low-cost skills (one skill costs only 3 MP for 5 hits) make her a DPS powerhouse. Neptunia.Virtual.Stars.Update.v20210407.incl.DL...
The game is Steam Deck Verified, though you may need to manually switch the active controller in the Quick Access Menu if using external gamepads. If you'd like, I can: Detail the best V-Cubes for a specific character The "Chapter 7 grind" is a common hurdle