If you're talking about Super Mario Maker 2, don't forget that this game was pretty much unfinished at launch and the most important things were missing: online multiplayer mode, super world editor, play levels made by Switch friends etc. Compared to Mario Maker 1 on Wii U you have worse controls with controller and touchscreen and almost nothing to unlock. Even worse: you can lose the medals you've earned.
Compare that to Mario Maker 1, which had the 100 Mario Challenge to unlock new characters you can play with - and you got new items for the editor every two weeks. The whole Mario Maker 2 game was a mess. A rushed release without a concrete plan. It also didn't help that Nintendo stopped supporting the game within less than 1 year.
OP:
Sales of Labo were disappointing. ARMS and 1-2-Switch were not the big new hits, which Nintendo maybe had expected. Yoshi's Crafted World, Astral Chain, Captain Toad, Miitopia, Mario + Rabbids Sparks of Hope also underperformed.