At a bare minimum, I'd only add Mario Kart 8 Deluxe to the "should buy" list mr. Marc already made.
Apart from that, I can recommend Pokken Tournament DX, Touhou Koubutou V, Sonic Mania, Puyo Puyo Tetris S, and Kamiko.
If you have a local playmate too, you could add Rorororo and Together Cut Snippers.
And for relaxing purposes, you could add the niconico app (or Netflix, depending on where you are).
One game other than 1-2-Switch I'd say you'd better stay away from is Platinum Train (though that game is free to play, so getting it any way doesn't hurt financially).
There isn't much physical wise to buy in the store, but if you browse eshop there will be a ton of titles to look over. Any type of games you enjoy most?