-What is your favorite Upanishad?
I don't have a favourite. But the Bhrihadaranyaka Upanishad is definitely somewhere at the top of the list.
-As someone who seems to have dvaita leanings as far as I'm aware based on things you've posted about what you believe moksha to be, what specifically do you believe a person must realize to "liberate" or reach moksha, in your worldview?
I'm neither Dvaita nor Advaita. I'm of the middle road- Dvaitadvaita
This means there is simultaneous Oneness and Difference with God (part of but separate).
For moksha, we must realise that God is the very Self of our own being, that there is no separation and that the individual is simply a small representation of God, the Whole.
“Desiring that he should become many, that he should make of himself many forms, Brahman meditated. Meditating, he created all things. Creating all things, he entered into everything. Entering into all things, he became that which has shape and that which is shapeless; he became that which can be defined and that which cannot be defined; he became that which has support and that which has not support; he became that which is conscious and that which is not conscious; he became that which is gross and that which is subtle. He became all things whatsoever: therefore the wise call him the Real.” (Taittiriya Upanishad)
"This Self is the lord of all beings, the king of all beings. As the spokes are held together in the hub and in the felly of a wheel, just so all beings, all creatures, all gods, all worlds, all lives, are held together in the Self.
He made bodies with two feet, he made bodies with four feet. He entered into all bodies, and because he dwells within the lotus of the heart, he is known as Purusha. There is nothing that is not surrounded by him, nothing that is not filled with him.
He assumed all forms. He assumed all forms to reveal himself in all forms. He, the Lord, is revealed in an forms through his Maya. He is tens, he is thousands–he is numberless.
This Brahman is without cause, without effect, without inside or outside. This Brahman is the Self." Bhrihadaranyaka Upanishad