This is the 1592nd most frequent Portuguese word.
sozinho
Alone.
Here, 'sozinho' is used as an adjective to describe the subject, indicating a preference for working without others.
Ele prefere trabalhar sozinho.
He prefers to work alone.
In this context, 'sozinho' emphasizes that the action was completed independently, without external assistance.
Eu consegui resolver o problema sozinho.
I managed to solve the problem by myself.
The word 'sozinho' is used metaphorically here to describe the state of the house as being unoccupied or left on its own.