With Hyrule Warriors: Age of Calamity just being announced do you think there is any more titles to be released for the Switch in 2020? If yes what do you think it is?

I think there will be one more game announced for this Holiday for the Switch, I feel like it could be New Pokemon Snap.

I don't really think so.  Bravely Default 2 still needs a release date, but I'm not expecting anything new. Maybe some smaller titles, or some DLC. New Smash character or Galaxy 2.

I mean, this year has been one of Nintendo's most unpredictable. It's possible, but I'm leaning towards no. We still don't have anything for 2021 besides the Super Mario 3D World port. That was probably intended for December 2020 anyway, but delayed.
We'll be lucky to get another port or remake due out before the end of the year. A new title is almost completely out of the question now, unless Nintendo waited until the final moment to announce it.

Monster Hunter Switch is coming

Edit: You meant 1st party, there are some strong rumours about 2D metroid 

I hope we get a new 2D Metroid, I can see it for 2021.

Super Mario RPG 2

Maybe some eshop stuff. Nothing big tho.

yes for sure there will be more stuff announced. At least one more pretty big game

I wonder if the big holiday game with “tires” in it we heard about earlier is Mario Kart live? If not, I’d love to hold out hope they’d drop a new f zero on us. Seems like wishful thinking, but feel like it’s hard to know anything with Nintendo’s unpredictability these days.

There could be, but I don't think so. I think with the upcoming Pokémon and Smash DLC, MARIO 3D All Stars and the Zelda game, all together they'll have a decent amount of impact for Christmas... Maybe.