I would say to look for something that looks like you would vibe with it, but is also a VERY well reviewed release. Like, there’s a lot of people complaining these days about how all open world games are kind of the same—meaning a lot of the meta-game tasks are similar—but especially if you’re not constantly playing them, just find whichever has the highest reviews.
Folks have mentioned Horizon, Spider-Man, and God of War, and those are all top-notch games in their genre! If you like sports, there’s some quality games for both football (USA) and football (int’l).
Street Fighter 6 just came out, and if you like fighting games, that’s maybe the best one out in a long while.
Racing, you’ve got Mario Kart on Switch which is CLASSIC; but also Forza Horizon 5 is a blast to drive around and do random races and challenges.
Also on Switch, you’ve got the two Zelda games (Breath of the Wild and the new one, Tears of the Kingdom), both of which are high quality plays with lots of different things you can do, and very little you strictly MUST do, so very chill!
This to say, there’s zero shame in just picking up whatever the current popular game is! They get well reviewed for a reason, and all you want is a good time? They’ll probably give you that! :)