If you haven't played Hyrule Warriors yet, it's easily one of the best warriors games, and from what I've heard, Fire Emblem Warriors builds on what HW had to be even better. Splatoon 2 and ARMS are fun, but ARMS heavily lacks in single player content... Octopath?
Oh, right. If you like Monster Hunter, Generations Ultimate is coming out in English next month. The graphics aren't as nice as World and it doesn't have the quality of life improvements that game brought, but it does have the largest variety of monsters in the series, and multiple movesets for every weapon.
Honestly, there aren't really many especially with games like Bayonetta 2 & Mario Kart 8 already on WiiU for instance. If you're planning on procuring a Switch, you're basically getting it for Mario Odyssey, Legend of Zelda, Breath of the Wild or both.