How do i make a house that is immersive like the oculus home?

So i'm working on a project and i need to make a house that is immersive like the oculus home and the world around it.
so can somebody help me on how to make the house cosy and a somewhat good surrounding for the house
i'm using UE4.21.2
help would be very appreciated
this is what i already created

the inside and outside



thx