I never really remember the years too well at a moment's notice so I thought it might be fun to list the games I enjoyed most each year and then try to rank them. (I played more than these games, these just made big impressions)
2017 - Breath of the Wild, Puyo Puyo Tetris, Splatoon 2, Mario Odyssey, Mario and Rabbids Kingdom Battle, Xenoblade 2, Golf Story, Mario Kart 8 Deluxe
2018 - Celeste, BlazBlue Cross Tag Battle, Splatoon 2 Octo Expansion, Kemono Friends Picross (my first Picross game lol), Valkyria Chronicles IV, Torna, Super Smash Bros Ultimate
2019 - Baba Is You, Yoshi's Crafted World, Box Boy and Box Girl, Tetris 99, Gato Roboto, Super Mario Maker 2, Untitled Goose Game, Link's Awakening, Luigi's Mansion 3, BBTag 2.0, Ai The Somnium Files, River City Girls, Astral Chain
2020 - Tokyo Mirage Sessions #FE Encore, Animal Crossing New Horizons, Xenoblade Definitive Edition + Future Connected, Hatsune Miku Project Diva MegaMix, What the Golf?, Clubhouse Games, Paper Mario The Origami King, A Short Hike, Minoria, CrossCode, Hades, Part Time UFO, Touhou Luna Nights
2021 - Super Mario 3D World + Bowser's Fury, New Pokemon Snap, Famicom Detective Club 1+2, Mario Golf Super Rush, Ender Lilies, Pokemon Unite, NEO: The World Ends With You, The Great Ace Attorney, Toem, Metroid Dread, Melty Blood Type Lumina, Blue Reflection Second Light, Gnosia, Cruis'n Blast, Chicory
2022 - Pokemon Legends Arceus, Deedlit In Wonder Labryinth, Kirby and the Forgotten Land, Chocobo GP, Switch Sports, Ai NirvanA Initiative, Live A Live, Xenoblade 3, Splatoon 3, Bayonetta 3, Mario and Rabbids 2, ElecHead, Blossom Tales II, Lunistice, Pokemon Violet, Mario Kart 8 Deluxe Booster Course Pass, River City Girls 2, Trails From Zero
2023 - Theatrhythm Final Bar Line, Metroid Prime Remastered, Magolor Epilogue, Trails To Azure, Bayonetta Origins, Advance Wars Reboot Camp, Xenoblade 3 Future Redeemed, Tears of the Kingdom
With it all laid out for me, 2022 is the winner for me, but wow 2021 was awesome too. I gave 2020 the edge over 2017 because while the big hitters certainly stomp over 2020's, I enjoyed Switch more as a platform far more in 2020 than 2017 and I think the quantity and variety of games that spoke to me in 2020 speaks to that. 2023 has a ton of potential to be one of the best years for the system if the upcoming big games hit for me and some of the smaller ones hit hard like I think they might. I guess for rankings then I'll roll with:
2022 > 2021 > 2020 > 2017 > 2019 >2018 > 2023 H1
What an amazing system.