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If the roots are still intact, by all means, try to right and replant your tree. Thirty feet is a good sized tree and it will need staking until it has re-established itself. That may take a couple of years. Good Luck!

If you feel it is getting enough water, then it is likely a fungus that is attacking the tree. Treat the tree with a fungicide. I personally like neem oil as it will treat for both fungus and pests.

If the branches are still alive, it will recover. There is not much that can be done other than what you have already done to get it to recover faster. It just needs time.

Most likely not. Many eucalyptus trees have bark that peels naturally and the peeling will get more pronounced as the tree ages. It is considered to be an aesthetically appealing feature of many varieties of mature eucalyptus.

If the stems are still alive, it can come back. This article will help you determine if it is still alive:
https://www.gardeningknowhow.com/plant-problems/environmental/how-to-tell-if-a-plant-is-dead-and-how-to-recover-an-almost-dead-plant.htm

Here is an article that you may find helpful: https://www.gardeningknowhow.com/ornamental/trees/tgen/how-to-root-cuttings-from-various-shrubs-bushes-and-trees.htm