single word requests - Is there a term for repeated phrases (not a catch-phrase)?

motif should work for this.

a dominant or recurring idea in an artistic work.

Just found another possibility, epanalepsis, courtesy of a rhetorical devices page on YourDictionary.

repetition of the same word or phrase after other words have intervened.

Thought of another one as well: trope.

The word trope has also come to be used for describing commonly recurring literary and rhetorical devices, motifs or clichés in creative works.