Same level of technology as today
Basic human psychology is the same
But you are allowed to change prevalent institutions, cultural assumptions etc.
So e.g. if you think that the modern school system is oppressive and traumatizing, you can describe a world that has something else instead. But you should describe the alternative at least a bit—what kids do with their time instead and how they learn skills and are selected into jobs. Don’t just say “no school”, give us a positive alternative vision.
Within those constraints, you’re allowed to change as much as you like and can think of.
What’s your utopia like?