Overworlds
Overworlds in 2D Mario games link the levels within worlds, and the same could be implemented in levels made in Super Mario Maker 2. Overworlds could allow creators to make a much bigger project through the linking of smaller levels, almost like playlists but more Mario-ish.
The addition of overworlds would allow for more story driven creations – although it may be unlikely that Nintendo will add RPG elements such as text boxes due to the difficulty that would come with filtering bad language, following the amount of inappropriate Super Smash Bros. Ultimate stages.
Overworlds aren’t usually something that comes to mind immediately, but the player tends to spend a fair amount of time with them in traditional 2D Mario platformers, so they are definitely a key element of sorts.
