https://www.zeffy.com/en-US/donation-form/save-trans-lives-the-koi-general-fund
Why it worked: The ability to quickly and easily donate combined with narrative about the specific utility of that donation level gives donors an intuitive understanding of the impact of that donation. With careful crafting, it also builds cohesive narrative.
One thing another non-profit could repeat: Ensure every offered donation level has a defined and meaningful impact. Undefined impact is a lack of clarity, and meaningless impact imparts no importance. The message needs to be clear and immediate.