If you want to make a documentary, I would like to know why your documentary will be better than what is already available, such as Not Just Bikes, The Death and Life of Great American Cities, or any other prior art.
Regardless, you still haven't answered my question. Why is making a multi-year, feature-length documentary better than a series of videos on YouTube? Why do you think that your chosen medium will be more effective or persuasive than previous works? In other words, why do you think you deserve donations?