You want to get your material in the hands of a producer that won't sit back and let someone else produce your music while they receive income on the publishing. Many say there is a balance between the smaller production agencies and the larger agencies. The smaller agency may have more time and less material to focus to the acts, but usually this advantage is more than made up by the larger exposure to artists to follow up with your material. Most important is the excitement a producer will express about your material upon submission. Keep the material quality and keep creating new ideas for new songs.
Timing is of the utmost importance.
A right material in the hands of the right producer who knows the perfect act or project for your songs is difficult. Create new, quality material and submit to several sources. Don't expect immediate results from your first submissions. Don't wait, keep expanding your ideas in music and keep submitting material. There are many songwriters who look back and laugh at a song they wrote years back when they thought is was really good at the time.