There's a deeper story than most realize, which tells the audience of chasing our dreams and the adversity we will experience along the way.
Almost There is the beginning of the hero's journey, aiming for goals and pursuing dreams, but seeing failures right out of the gate (i.e. Hercules being crushed).
We Know the Way is when you become more certain of yourself and have created a path towards your goals, beginning the journey with those you trust.
Joe Gardner takes the story into the "zone", with the Mary Blair artwork and music representing the whimsy and joy we feel when genuinely pursuing our goals. We're on top of the world with success, and feeling the joy of those rewards. This segment also covers the friendships and relationships we create along the way, which help us "fly".
Our journey to our goals will sometimes take us "Into the Unknown", where fear and self-doubt take their tolls on our motivation.
Finally, we can spiral out of that unknown into full blown defeat, as our inner demons consume us (Night on Bald Mountain)
I Am Moana then represents the moment we find ourselves and snap out of that defeat, triumphantly realizing that we once again "know the way".
The show then ends as a reminder that we cannot sit back and wait for out Happily Ever After to magically bestow itself upon us. We have to get up and chase our goals, feeling success, failure, and every emotion in between. We are the magic in our own stories, and we control our destiny.