Whoops, kinda missed this thread and it looks like others did too.
Wish I was as good at planning for the future to decide on stuff like this lol.
Animal Crossing, Hades and Picross were my most played ones by a country mile last year, but otherwise I tend to play shorter games. Out of those three, I'm only really planning to continue with Hades, but may check in on Animal Crossing if it continues getting updates (at least one is planned). Don't anticipate either of those dominating my year again though.
RPGs: I tend to play 1-2 RPGs a year, so maybe EarthBound or Xenoblade finally makes the cut? (Although I've been saying that for years lol.)
Probably won't be Monster Hunter, since I'm just not drawn to that franchise at all. The new one looks impressive though, so maybe I should give the demo a fair shake. Disco Elysium is another RPG slated for this year, hopefully that gets a good port. Wildcard option this year would be Shin Megami Tensei 3 or 5; my only exposure to that series is tangentially through Tokyo Mirage Sessions. Heard they're very difficult though, which is a tad off-putting.
Racing/sports/fighting: One of these can go in the constant rotation bucket. I doubt King of Fighters 15 will be on Switch unfortunately, but maybe MLB The Show will? Also open to suggestions for a good anti-gravity racer, is FAST RMX still the top choice on the eShop in that regard? A new F-Zero, or just a re-release of GX would make my year.
If Breath of the Wild 2 already launches this year I'm dropping everything for that game, although I'm skeptical about it making 2021. It's got near-impossible shoes to fill though, so need to keep my expectations in check.
Last one: if Arika manage to squeeze out another multiplayer thing (Dr. Mario?) I'll definitely try it. Played a lot of Tetris 99, and very little Mario Bros. 35. Don't know how feasible their current annual schedule is though, there were 18 months between those two, which would make June 2022 their next date. But who knows!
With a child on the way later this year, turn based games are sure to dominate the list since I'll more easily be able to pick-up and drop as needed for caretaking.
Exciting! Hope everything goes well!