I get motion sick in 99% of first person type shooters and most ‘camera following the person’ open world type games (like Odyssey)
I can play MARIO for around an hour and a half before needing to take a break.
That’s one tip... take a break every hour or so, do something that requires looking at a distant, STABLE horizon. It gives your brain chance to calm down and settle.
Also, while playing the game, limit how much you use the camera ‘look around’ function and movement changes, and when doing so, focus solely on MARIO, not on the spinning landscape around him.
Hope this helps.