A young aspiring photographer gets a chance of a lifetime for his work to be shown in a prestigious gallery in Chicago, but is interrupted when his brother, the heir of their family farm, dies unexpectedly leaving their ailing grandfather to try to find a new caretaker before the competitors try to buy off all of their land.

This describes a situation but not a plot.

What is the main character’s goal? And what is his inciting incident?

I think the problem in this logline is with the concept.? There have been several iterations of the same logline, but none have yet described a dramatic enough situation and compelling enough action for a film.
The stakes are just too low. Best to focus on designing a clear goal with high stakes.