I love how many people have gone with Animal Crossing! If I hadn't played New Leaf every day for 3+ years, it would definitely be on my list, but there's only so much left for me to do on there. If the Switch version was out it'd be a different story, but since it isn't...
My three games would be Let's Go Eevee, NHL 19, and Sonic Mania. Realistically I'd probably be fine with just one of them since I can't game in long sessions like I used to, but I guess it would be nice to have the variety.