Sing it through. How did it sound? You may have noticed that somehow now the melody got predictable and stale. Why? Constantly repeating an idea over and over again has its pitfalls as well. If you repeat something too many times, it can become nauseating and really boring.
So how should you proceed? On one hand, if you don't repeat any melodic ideas, your listeners may think that your music is absolutely random and you have no idea what you're doing. On the other hand, If you repeat too much, your song will sound like it's stuck on a loop, the singer will seem more like a robot than a genuine person sharing a story, and ultimately you risk your listeners getting bored, annoyed, and worse of all, skipping your song.
As you can see, you need to find the right balance between introducing new ideas and repeating the ones that have already been established.
So now sing the eight-bar melody once again, this time specifically listening for the exact moment where you wish the melody would change. When do you get bored?
Odds are you said measure five. And that's where I would've hoped that the melody would finally change. How much change you introduce is up to you, but as long as you're introducing some new idea your listeners will thank you for it.
5. New chords
One of the best songwriting tips and easiest way is to change things up is to alter the underlying chords. Following that thought, I'm going to change the chords in that third phrase (bars 5 and 6) as well as the final chord of our verse (bar 8).