Hey congrats! I still can’t find any lol but there’s still some great games to play.
I know many games were optimized for Series X/S, so you’ll automatically get the Series X version of the games that have been optimized.
As far as Xbone games you missed, can’t go wrong with the Forza Horizon games or Gears of War games. My personal favorite was Sunset Overdrive! Who would’ve thought Insomniac Games would make an Xbox exclusive? Lol I highly recommend that one and maybe the Ori games if you’re into Metroidvania’s :) have fun!