How can Nintendo make their games big again?

[okr]

Last gen Nintendo's best-selling IPs were not just big, they were HUGE and sold in the range of 10 to 30+ million per game. This gen they are "just" big, i.e. their best-selling IPs sell around 5 to 10+ million per game.

Still no other console manufacturer could/can compete with Nintendo when it comes to sales figures of own IPs.