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This article has the proper method for pruning this tree:
http://www.ca.uky.edu/agc/pubs/ho/ho45/ho45.htm

After two years, the bark should have healed itself. As long as the bark is not girdled (removed all the way around the tree), the tree should be ok without the duct tape. If it is still leaning, you may want to put in a stake on the far side and use some rope to gently pull it back straight.

You can start pruning it more severely to make it more shrub shaped than tree shaped.

The larger a tree is, the more likely it is to experience transplant shock. At this point, it would have a rather difficult time to move to a new location.

On average, about 20 years, give or take.

This article will help: https://www.gardeningknowhow.com/plant-problems/environmental/how-to-tell-if-a-plant-is-dead-and-how-to-recover-an-almost-dead-plant.htm

You may be having a problem with phosphorus. Plants require this nutrient in order to bloom. Here is more information: https://www.gardeningknowhow.com/garden-how-to/soil-fertilizers/phosphorus-plant-growth.htm