I'm sure other people have thought of this (and perhaps even posted it), but so many people have posted 'musical problem' issues, that I thought I'd post a rather simple (perhaps too simple) general solution:
Listen to Beethoven (or a composer of your choosing) and copy a general solution Beethoven used. That is, Beethoven uses a lot of 'Call and Response'...have an oboe call a theme and have the symphony respond in kind.
Or have an instrument call a theme and have a different instrument call the same theme in a minor key.
Or...I could (and Beethoven does) go on.
I think a lot of people get caught up in musical particulars so that they can easily miss the musical forest for the trees.
Of course, any solution that actually works (yours, mine or ours) is a good solution...happy composing!!