Writer's Digest had loads of free e-newsletters, and they often focus on a productive strategy to help you get ahead. Here for example are the seven reasons agents stop reading. You can see the full article here.
1. Generic beginnings
2. Slow beginnings
3. Trying too hard
4. TMI (Too Much Information)
6. Loss of Focus
7. Unrealistic internal narrative
Now that you know what makes them stop reading, rework your proposal to improve your odds of success.