How do you end songs that dont have an actual ending and just fade out at the end?

I checked out some videos of Elliman performing live, but unfortunately the video fades out with the end of the song. So this is what I do...

If you are performing with a prerecorded track--such as a karaoke-type accompaniment, then YOU can fade out with the music--sing progressively softer toward the end. If you sing live, then all you have to do is agree ahead of time with your accompanist (for example if a pianist or band is playing) about how many times you want to repeat "If I can't have you, oh oh". You and everyone else ENDS with that final "oh, oh, oh". See? Don't overthink it. It's your performance and you don't have to sing it EXACTLY like the original recording. Unless you have some backup singers, you are going to have to improvise anyway.

Glee gave Don't Stop Believeing by Journey a great ending

I want to perform "if i cant have you" by yvonne elliman for my school's fundraiser but its one of those songs that just keeps doing at the end. how do you perform those types of songs?