I've answered a thread like this before, but since 2020 turned out a bit different than I expected I'll make some slight adjustments:

Bayonetta 3
BotW Sequel
2D Metroid
Diamond and Pearl Remakes
New Pokémon Snap

New Bayonetta
Zelda BOTWF2
Shin Megami Tensei V

Botw2, 3d world, bayonetta, nmh3, gods and monsters (will have a new name), biomutant and a bunch of games i wont care about because a it wont all be on the cartridge, b it will be a ps3 era port, c it will run like crap, or d it will be super casual.

Q1: Super Mario 3D World +, Kirby

Q2: New Pokemon Snap, Mario Golf

Q3: Bayonetta 3, New Series, Metroid: Samus Returns HD

Q4: Pokemon Sinnoh Remakes, Breath of the Wild 2

I'm fairly optimistic

Super Mario 3D World
No More Héroes 3
Shin Megami Tensei V
Bayoneta 3
Pokemon Pearl & Diamond Remake
Pikmin 4
F-Zero
Warío Ware
Nintendogs

Zelda HD Collection ( Skyward Sword, Twilight Princess, Wind Waker )

Super Metroid

Bravely Default II

Starfox Wii U

Holiday title: Zelda Breath of The Darkness

I predict 2021 Will be Switch' strongest year

November/December 2020: Pokemon Snap and new Monster Hunter

Q1: Super Mario 3D World, Kirby

Q2: Switch 4K, Super Mario Odyssey 2, Detective Pikachu, Zelda Collection

Q3: Bayonetta 3, Shin Megami Tensei V

Q4: Xenoblade Chronicles X, Pokemon Remake, No more Heroes 3, Breath of the Wild 2

Software or hardware wise?

Why choose when you can have both?

Mario 3D World+
BotW2
Zelda collection or port
Bayonetta 3
Pokemon Diamond/Pearl upgrade
Mario Party game
Tomodachi game
Mario sports game
Kirby game
Wario game