First, collaborations encourage creativity—and pairing a big-name producer with a new artist can also help break them into the scene; secondly, hiring a crowd of writers makes the process of creating a song much faster.
Lyric and music need to support each other. Consider using that pattern in your own chorus.
Notice the natural up and down motion and the rhythm of your spoken words. If your verse has a lot words and a busy, choppy melody, consider smoothing and stretching out the melody in your chorus so listeners can really hear the difference.
The others? At its core, the single is a piano ballad examining the demise of her. Artists themselves might not be happy with having to split their royalties with more people than before.
Try to beat what you already have. Whether you want to pitch your songs to established artists in the Pop field or sing them yourself, writing a contemporary, commercial Pop song with hit-single. It had its hay day decades ago. Rinse, repeat. Write your lyric like a script for a movie.