[X] The present. Here you stand, before your brother. Here doubt has driven you. Does Zuko doubt, too? Is he still angry at himself? If you were him, you would be. But maybe that's his secret. Maybe he's always angry. Maybe you're angry too. The world isn't what you thought it was—and you think Zuko can relate. What will happen if you let him?
As stated, Zuko doesn't have a plan and I don't think Azula will approve of that. Same dance as always. However she's dressing this up as the need to talk to him about his plans for the future, though, I don't think that is what this is about. Azula legitimately doesn't understand Zuko, which is fair because he barely understands himself. And vice versa. But I think if they talked some kind of understanding is possible.
More importantly, the elephant in the room is Ozai and Azula's love for him. That has nothing to do with the future and everything to do with how Ozai has treated Zuko, and Zuko's decision to finally rebel against him.
Zuko's plan is: "I don't know what comes next, but father is awful and we can't let him rule the world. And doing anything to please him makes you awful." Azula needs to hear that, because when she hears that laid out in plain language from Zuko I don't think it will be that easy to dismiss. The most important thing she can realize is that she's ALSO angry at Ozai and for good reason.