Free save editors for Diablo III: Eternal Collection on Nintendo Switch exist, but they require a hacked console running Custom Firmware (CFW) to function
Capabilities: Allows you to edit character and account items, gold, materials, gear, and stats. diablo 3 nintendo switch save editor free
Modding your save file can significantly impact your gaming experience and account safety: Diablo 3 Switch Resource Exploit & Modded Saves on Season Free save editors for Diablo III: Eternal Collection
Q: Do I need a modded Switch to do this? A: Yes. You cannot edit a save file on a stock, unmodified Switch. You need custom firmware (CFW) to extract and inject the save data to an SD card. or items as desired.
Conclusion
Edit: Open the file in D3StudioFork. Modify your stats, gold, or items as desired.