I’ve run into some aspiring songwriters who believe they have “the song" - the song that will set the world on fire. And if they can just get “the song” to Kenny Chesney or Carrie Underwood, they know it’ll be a surefire hit.
The hard truth is that it’s foolish to put all your hopes on ONE song.
So much timing, luck, and networking goes into getting a cut, much less a hit, that you need a CATALOG of great, commercially-viable songs. If you have a bunch of great songs working their way through the system, MAYBE one will get cut.
If you've really written one great song, that's awesome. Now focus on writing more great songs.