If the game crashes immediately at the title screen, the global profile save is likely corrupted.
Open the broken save file back up in your PC-based save editor. diablo 3 nintendo switch save editor fix
Here is a detailed breakdown of the situation regarding save editing on the Switch, why old methods fail, and the current reality of the game's security. If the game crashes immediately at the title
To get your save data, you must run a homebrew save manager like or JKSV on a hacked Switch. This means the process inherently requires custom firmware (CFW) and carries a risk of being banned by Nintendo if done incorrectly. why old methods fail