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This article gives you the basics of rhodedendron care: https://www.gardeningknowhow.com/ornamental/shrubs/rhododendron/rhododendron-care.htm
After you've checked on the basic requirements to see if there are problems there, there are a couple of other possibilities. The first is that you're pruning at the wrong time (any time after late spring) and cutting off the flower buds. Here's an article on pruning: https://www.gardeningknowhow.com/ornamental/shrubs/rhododendron/pruning-rhododendrons.htm
The second is that deer may be eating the flower buds, which they are fond of. Here's an article about protecting from deer: https://www.gardeningknowhow.com/plant-problems/pests/deer/deer-repellents.htm

Yes, too much water is not good for rhodedendron. There are many things you an do to improve your bloom -- read on: https://www.gardeningknowhow.com/ornamental/shrubs/rhododendron/rhododendron-care.htm

You can try moving it. Make sure to dig up as many of the roots as you can. This article has information that will help you find a better place for your plants; https://www.gardeningknowhow.com/ornamental/shrubs/rhododendron/rhododendron-care.htm

Your rhodedendron was probably damaged by the severe winter weather. which probably didn't help an already old plant. Why don't you do some heavy pruning, fertilizing, and give it a couple of years. Here's an article on rhodedendron pruning: https://www.gardeningknowhow.com/ornamental/shrubs/rhododendron/pruning-rhododendrons.htm

This article should provide you with some answers: https://www.gardeningknowhow.com/ornamental/shrubs/rhododendron/rhododendron-sooty-mold.htm

Yes you can. Here's an article with some tips on growing shrubs in containers that might be useful to you. https://www.gardeningknowhow.com/ornamental/shrubs/shgen/potted-shrubs-growing-shrubs-in-containers.htm