Nintendo Switch 10 million sellers

[PAOerfulone]

Already:
Mario Kart 8 Deluxe
Super Smash Bros. Ultimate
The Legend of Zelda: Breath of the Wild
Super Mario Odyssey

Guaranteed:
Pokemon Let's Go Pikachu/Eevee
Pokemon Gen 8
Pokemon Gen 9
Pokemon Gen 4 remakes
Splatoon 2
Animal Crossing Switch

Possibilities:
Super Mario Party
New Super Mario Bros. U Deluxe

Puncher's Chance, but Unlikely:
Luigi's Mansion 3

That's all I've got at the moment and even then, Gen 9 and Gen 4 remakes are just hypothetical.