Valheim is fantastic, Kenshi is brutal and unforgiving but very fun, outward is similarly difficult and fun, also very unique.
Open world is kind of a huge genre, so I'd even say games like Subnautica, terraria, etc might be up your alley.
Edit: I can't believe I left out no man's sky and hyper light drifter! Highly recommend them both, no man's sky is such a good space life sim and hyper light drifter is kind of like a throwback to the first Zelda game, but obviously updated and with some different intentions to the gameplay/story. Happy gaming!