Devuélvanme is a powerful and somewhat formal command, meaning "give back to me" or "return to me." It's the imperative form of devolver (to return/give back) combined with the indirect object pronoun me (to me) and the plural command ending for ustedes.
In the song, the singer uses this word with a sense of longing and desperation, pleading for the return of her friends and the simple joys of life. It's a poignant expression of loss and yearning that stands out in the lyrics.
The whole song hangs on one plain demand, repeated like knocking on a door: Devuélvanme a mis amigos (give me back my friends). Around it, Silvana Estrada lists the things that used to help and no longer do. A shaft of light walks into a room with nobody in it: Un rayo de luz (a ray of light), Entrando a un cuarto vacío (entering an empty room). The sun still shines and it stops reaching her, Ya no me arranca del frío (it no longer tears me out of the cold). Night comes down and blurs sleeping into forgetting.
Underneath the list sits a question she circles back to three times and never answers: ¿Cómo será de hermosa la muerte (just how beautiful must death be), Que nadie ha vuelto de allá? (that nobody has ever come back from there?). By the last verse the bargaining has run out and what is left is Que sólo nos queda llorar (that all that's left for us is to cry). It was recorded for A COLORS SHOW with almost nothing behind her, her voice and the Venezuelan cuatro, and it ends on a long wordless refrain that runs on after the words have stopped being any use.