well I play mostly racing simulators, so Assetto Corsa Competizione for example is great, as is DiRT Rally 2.0 - But probably the BEST graphics would be Half Life Alyx
With Half Life Alyx, (And the fact its a VR game aside) its like you are actually THERE. Not 'there' as in 'inside a video game' but there as in actually stood on a balcony looking down...
But that said, any of the games in the following video would look great on my rig. It can handle the ultra settings on everything
You would be fine for all of the above with your 30 Series card for sure