Your song reminds me of some of the composition types I would play when I was heavy into violin. You seem to have the Prelude completed - and well composed.

I think the reason you are having difficulty at the moment is because the music is taking a more jovial tune and you are not feeling jovial inside yourself. It is easier to express what we feel. Try to recall a moment in your life when you were super excited or happy (doesn't matter what the end result of the event was - just think of the moment you felt that excitement or happiness), let that feeling touch you just enough to be able to express or describe it (as you would be able to describe what was happening at the time a picture was taken when you look at the photograph) then express that feeling in your composition. You are telling a story through music. That's what compositions are about. So when you get stuck on an emotion, just recall a time and place in your life you felt that emotion.

I hope that helped.

❤