A cheering song from someone who has left

This is my first original song.
Life is not infinite, and as long as we are alive, we will lose loved ones, pets, and so on.
The protagonist, who is in a state of regret and sadness in the first half of the song, feeling like an empty shell, regretting that they can no longer speak, sings a message in the middle and latter half of the song that she wants to convey to him, and I put this melody to it.