: Bring back the original theme to "tie everything up in a bow".
To make it a full piece, you need contrast. A common "classic" structure is : A Section : State your main theme. classic
: Try setting a "one note" restriction at first, focusing solely on the rhythm and tempo (e.g., 60 BPM in 4/4 time) before adding more notes. : Bring back the original theme to "tie