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This article should help you with that: https://www.gardeningknowhow.com/ornamental/shrubs/hydrangea/prune-hydrangea-bushes-hydrangea-pruning-instructions.htm

I would try again with traditional rooting methods. Even the best professional gardeners do not have a 100% success rate. Keeping humidity up around the cutting it key to success though.

Honey is not a rooting hormone like willow water, but it can help in rooting cuttings. It is anti-bacterial and helps to keep disease away from the open wound on the cutting, which means that the cutting will have a better chance at rooting.

The soil under pines tends to be high in acid. But more likely, the tree is using up all the water in the area and this is what is killing the plant. This is common. It would be probably best to move it.

It has fungal leaf spot. Control options include cleaning up and disposing of any fallen leaves or removing those still on hte shrub to prevent spreading. Avoid overhead irrigation, which wets the leaves, and use drip irrigation, soaker hoses or a watering wand instead. It is helpful if your oakleaf hydrangea is planted in an area where there is good air circulation. Make sure it is not crowded by other plants. This permits the leaves to dry quickly after rain, which helps prevent leaf spot diseases. You can also apply a fungicide.

This article should help with that: https://www.gardeningknowhow.com/plant-problems/disease/learn-about-plant-rust-disease-and-rust-treatment.htm

I would suspect that they have too little phosphorus, especially if they are planted near a lawn area that gets regularly fertilized. This article will explain more: https://www.gardeningknowhow.com/garden-how-to/soil-fertilizers/phosphorus-plant-growth.htm