Unless Nintendo makes a 3rd pillar to their bussiness and release a Smartphone, the original Wii fanbase is long gone. Nintendo should keep its focus on both core gamers and young audiences. An approach similar to the DS might help. It cattered to everyone, was cheap and if you looked enough, its library was able to satisfy anyone.
Improve the relation with 3rd parties, make a console easy and cheap to develope for: most of the DS and Wii titles were possible only on the Wii because it was a simpler architecture than the others. That way, developers can experiment and give an unique library to the console.
Also, make it compatible with thw QoL systems and devices.










