I would recommend Xenoblade Chronicles 2, Mario Odyssey/BOTW, and Splatoon 2/Mario Kart 8. Imo, this gives a decent variety.
Xenoblade Chronicles 2 - JRPG game. Strongly recommend if you are a jprg fan. Fun and many hours of gameplay. I have 100 hours in and still not done. (I am biased towards this game also so take my opinion as you want to)
Mario Odyssey/BOTW Though BOTW is definitely best for open world experience, odyssey is still super fun and both kind of let you do what you want, though Odyssey is bit more linear. However recommend both, but if limited to choice of 2-3 games, I would choose one for now and get the other one at a later point. Either game will also keep you busy long enough until you can get the other.
Splatoon 2/Mario Kart 8 - Just a fun and relaxing games. Just when you want to play with others or take a break from the RPGs.