Monster Hunter (this is very much needed, all about Switch says it is the optimal MonHun-platform)
Pokemon
Souls (the Dark Souls trilogy would do, but a new sould series, maybe Dead Souls would be great)
Etrian Odyssey (or something similar)
Persona Q 2
Deus Ex
Metroid Prime
Pikmin 4
Switch Sports Resort (can actually be like Wii Sports Resort with some different events)
Disaster: Week of Crisis
Persona 5
Trauma Center
Kid Icarus: Uprising HD
Hotel Dusk
Descent HD
Zen Pinball
Horizon: Zero Dawn
EDIT:
Little King's Story HD
The Witcher trilogy