Lots of great games there. My favorites:
- Kingdom Come: Deliverance - non-fantasy, medieval open-world, aiming a little bit more at realism, great for history freaks
- The Witcher 3 - no explanations needed :) and it's dirty cheap,
- Cyberpunk 2077 - it already is a great game and it will be majorly overhauled when expansion comes out, so maybe worth getting it now when it is on sale,
- Return of the Obra Dinn - phenomenal, unique, detective experience
- Disco Elysium - one of the best writings in games ever, unique RPG systems
- All Stalker games are great if you are into classic Euro-jank ;)