The recently released and excellent Super Mario Bros. Wonder has some solutions that Nintendo could take into the third dimension.
On Nintendo Switch, several core franchises have received sequels and DLC (The Legend of Zelda: Breath of the Wild, one of the launch titles, was continued in The Legend of Zelda: Tears of the Kingdom), but although Super Mario Odyssey was released during the platform’s first year, it was ultimately not followed up, even though the story could be repeated in Super Mario Sunshine and Super Mario Galaxy (fans would love to buy a sequel, but the big N doesn’t do that).
In the 3D Mario games, the Capture feature allowed you to take control of objects, characters and enemies, but in the recently released 2D creation, you can also turn into an elephant. The two could be linked, as in Super Mario Bros. Wonder, one of the Wonder Effects turns Mario into a Goomba. In fact, Cappy from Odyssey and the Wonder Flower from Wonder take a different approach to achieving the same goal (adding a new level of gameplay). The Wonder Flower could therefore be taken into the third dimension, allowing exploration and transformation to continue in a possible sequel.
The Flower Kingdom introduced in Super Mario Bros. Wonder could be incorporated into Super Mario Odyssey, so the two games could have a sequel together, and the story has the potential to do so. Prince Florian could again control the effects, just as Cappy did in Super Mario Odyssey during the Capture game mechanic. Except that the Nintendo Switch sequel will almost certainly be out in a year’s time.
The design of Super Mario Odyssey influenced the Switch port of Super Mario 3D World in its Bowser’s Fury DLC. But it will take more than that to make a sequel. The big N doesn’t really listen to its audience.