Thinking about that part in Arcane when Ekko shows Vi the tree, and he says that if it can grow and thrive down there, then they can too.
"This world is a wasteland where nothing can grow." This plays as Jinx decides to kill herself. It's the exact opposite of what Ekko's tree represents. Growth in a desolate wasteland. It really re-enforces to me that Ekko was the ONLY person who could've talked Jinx down in that moment.