Any musical work can be broken down into sections. There is often a recognizable pattern to and within these sections. (I think as a species we are just drawn to patterns). You can identify this pattern and label your sections accordingly. This is the time to indicate things like rehearsal markers, repeats, and codas. Or you may prefer using terms like chorus, verse, and bridge. You’ve got options! So what are you looking for?:
Count out your measures and split the song into sections on your score. You may want to indicate this with double bar lines and/or lettered rehearsal markers. Most sections will be an even number of measures, like 4, 8, or 16.