I know it's dumb but I personally find Stardew incredible stressful. The time limits on growing stuff/missing daily events combined with your energy ticking down makes me feel a lot of pressure to play correctly.
I know what you mean - but on the other hand, there is no way to lose. You grow your vegetables and they are bringing quite the profit margin. If you "die" in the dungeons, you just wake up at the start. Your crops can't fail. You can wait for years to finish some quests.
Time game is functionally infinite. If you miss an event this year, that's fine it will be back next year.
One of the few things that is permanent is Robin increasing her prices after year one.
Apico, a game about breeding bees. Very calming in the way that it's almost impossible to fail. Unlike even stardew valley there are no obligations or timed events you have to deal with.
Alba. It's about a young girl visiting her grandparents on the island they live on and helping the animals. It's made for children, but that made it non stressful to play.