A lot of open-world games give an “endless world” vibe, even if the game itself has a finite plot.

For example, games like Ghost Recon: Wildlands and Ghost Recon: Breakpoint, the entire Just Cause franchise, Zelda: Breath of the Wild and Zelda: Tears of the Kingdom, Tom Clancy’s The Division 1 and 2, etc. are all games that let you continue to explore the game and do whatever you want, even after the main plot has been completed.

My friends and I like to fool around in the Ghost Recon and Division games, even though we beat them ages ago. It’s fun to just explore and cause mayhem and destruction, fighting infinite waves of baddies. And there’s not much grinding required because we leveled while playing through the main story. As long as the world is immersive and you can find stuff to do, you could practically play forever.

Actually, a great example of this would be Enshrouded. It’s an open-world crafting/base-building game, but it’s set in a medieval fantasy world, so there are quests to accomplish, lore to discover, and gear/weapons to acquire, build, and level. And when you’re bored of that, you can just settle down and build your own fantasy city. And it’s all single-player, unless you want to invite friends into your game. Or you can make your session public and let strangers check out your game. You can lock down their access so they can’t destroy anything you’ve built or take any of your resources. Then you guys can quest together or build epic castles or villages or Hobbit homes together.

A similar game that just released is Windrose. It’s the same base-building/questing concept as Enshrouded except instead of medieval fantasy, it’s theme is pirates in the Caribbean in the 1700s. You get to build and sail ships in this game, and even duel against other ships!