DKR2, the Switch has MK8 but it's a port from a previous system, Switch should have its own karting game in the form of a new DKR. MS wants to collaborate more with Nintendo right? Well, they should allow Nintendo to use some of Rare's characters in the game.
Proper Paper Mario
F-Zero NX
Mario Football 3
Earthbound 64/Mother 4 in Mario Odyssey engine
Wario Ware Switch! Srs, why was this not a launch title to sell the Joycons
Advance Wars Switch, enough of Fire Emblem, bring back AW
2 3rd parties with:
MML3
Wonderful 102
On top of some of their handheld output like another Tomodachi Life, Animal Crossing, handheld Zeruda and Swtich will be a really nice system.