If they don't have any major new releases, just having some Mario remakes or Mario collection paired with a Switch Sports would be plenty. Bring in people with Mario nostalgia and then give them a new Wii Sports like experience to have fun playing if Covid continues to last for several more months. It'd also be a perfect time to get another Ring Fit game out there with everyone working out at home these days. Mario Collection + motion control Switch sports + new Ring Fit would be a killer combo even without a new AAA mega selling title.