Last year's harvest?
Few suggestions:
1. 2 min at max.
2. Add royalty free music:
www.bensound.com/&ved=2ahUKEwj19bPcqc_oAhUIX80KHdZODWAQFjAAegQIAxAB&usg=AOvVaw1AS7lEIZPb7rJ6TEpc6xu0
3. Different angles, time it to the music
4. Use intelligent flight modes, DJI software is decent at smoothly following an easily discernable object like a combine.
5. Drop in either narration or text with interesting info.
6. Similar to #3, get as much B Roll as possible with different angles, zooming in/out, flying by fast, spiraling out, get creative.
Keep up the good work, it's fun!