I vote for that one--"settling". Especially with the lyrics, but also with the melody.
For lyrics, use a rhyming dictionary and a thesaurus and find more interesting and/or more suitable words. If it doesn't feel right, if you get stuck, set it aside and sleep on it. Then try again. Post the lyric in
Lyrics and point out the spot or spots troubling you and ask for suggestions.
For melodies, try inverting an interval or reversing all the intervals of a phrase, raising or lowering a motif a third, adding melisma, using repetition. Take a phrase from a song you know and turn it upside down and/or change the rhythms. There are so many ways to mess with melody.
Vicki