Retail
+ Dragon Quest Builders - I have no idea why this game is so under-looked. It's as beautiful and happy as any DQ game, it's as deep and inspiring as Minecraft and it's a very unique take on a genre that was dominated by Minecraft. The 2nd game will have multiplayer and even more content.
+ Xenoblade Chronicles 2 with Japanese audio DLC. Similar to Tales of series. One of the best JRPG with a touching story and brilliant Japanese seiyuu.
+ Bayonetta 1-2 with Japanese audio. Tanaka Atsuko voices Bayonetta and if you know who she is, you probably have already played the game (if not - look up -_-). The game features great action and story and I doubt there'll be anything like this game in the future (except B3, of course)
+ Civilization VI - I strongly believe that Civilization is best to start with the 5th game + all add-ons and it's a real shame that Firaxis don't seem to want to bring the DLC that are already out on PC to Switch, but still. Civilization VI is one of those games you won't be able to put down for hours and there will always be something new to discover.
Eshop
+ Onimusha: Warlords - having played this game after experiencing Nioh, it's not as mind-blowing but still a very good game if you want more of samurai games which are practically non-existent nowadays. The game is priced fairly for its short length, too.