My guess would be something like:
February -
Reveals for Fire Emblem (May/June), Xenoblade (2022), an EPD game (2022), casual horse stinker (perhaps - this could be a standalone reveal)
Dates for Kirby (March/April), Splatoon 3 (June/July), Advance Wars (April)
E3:
Dates for Zelda (November), Bayonetta 3 (October), Mario + Rabbids (August/September), Xenoblade (September to December), EPD game (September to December)
Reveal & date for Metroid Prime HD (September to December), first look at Prime 4
That's 13 first-party releases that year, plus Mario + Rabbids and Triangle Strategy. There'd be a bit more, really - more third-party stuff published by Nintendo outside Japan, plus some eShop titles.