Q.Hi, My Rhododendron Is Dying? What Can I Do?
My rhododendron was fine for a few years and flowering beautifully but this year its dying. Help!

Certified GKH Gardening Expert
This looks like, what is known as, Fungal Dieback. This can be caused by a number of fungi, and can be treated with copper sulfate or other fungicides. I would be sure to keep your soil quite acidic to avoid fungal issues. Here are some articles that will help:
https://www.gardeningknowhow.com/ornamental/shrubs/rhododendron/issues-with-rhododendrons.htm
https://www.gardeningknowhow.com/garden-how-to/soil-fertilizers/testing-soil.htm
https://www.gardeningknowhow.com/garden-how-to/soil-fertilizers/soil-ph-plants.htm
https://www.gardeningknowhow.com/ornamental/shrubs/rhododendron