Congratulations on you purchase!! So you alraedy have Pokken tournament, that's a good one! Now I totally recommend you Super mario Oddyseey, you are going to have plenty of hours of joy playing Mario levels. Then, if you like more open world adventure games, I strongly recommend you to get the legend of Zelda breath of the wild. Maybe, cause you have already bought the switch you might be low on available budget, so in that case, I can recommend you Owlboy, that is an indie pixel art platform game with a really touching story, believe me, you won't be disappointed on this one.