I'm glad you're getting back into it! A lot of people have been picking it up either for the first time or the first time in a long time due to the pandemic, my dad who hasn't played games since when he had an NES as a kid is now gaming on my brother's old gaming PC playing games like Portal and Call of Duty.
I would definitely recommend Animal Crossing and Mario Odyssey as your next purchases, at least for playing on your own. Zelda and Mario Odyssey are easily the two main games to play on the Switch, at least in the sense of a "traditional game" because Animal Crossing is a very different style of game, there isn't really an end game, it is just a game about decorating and building your island and having no set goal, sort of like Minecraft in a sense.
If you have anyone else with you and were interested in some local multiplayer games, I would say Mario Kart and Super Smash Bros. are both incredibly fun to play with others. Mario Kart is very casual, very easy for anyone to pick up and play. Smash Bros. is unique from many fighting games because it is designed to be played casually, for the most part, but also has potential to be played competitively. If you wanna just have fun and play with items and do whatever, that's how I used to play Brawl on the Wii. It wasn't til I played Melee and Smash for WiiU at my friend's house in high school that I got into competitive Smash, and now I have hundreds of hours on my Switch on Smash Ultimate and it is very fun to throw yourself into if you want to get into a more competitive game eventually, but remains equally as fun to play casually. It is honestly even fun playing single player, there is a "story mode" called World of Light that is fun to play through and breaks up just playing normal matches against bots over and over.