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This can be pruned, frugally, but a hard cutback is not possible. Unfortunately, you can only do light to moderate pruning.

This article will help:

https://www.gardeningknowhow.com/ornamental/trees/spruce/cutting-back-dwarf-spruce-trees.htm

These articles will offer more information:

https://www.gardeningknowhow.com/ornamental/trees/spruce

This appears to be Cytospora Canker disease. This disease is best managed rather than treated. Removal of infected material, or removing the tree, completely.

https://www.gardeningknowhow.com/plant-problems/disease/cytospora-canker-disease.htm

Unfortunately, your photos didn't come through. I am not able to get a look at the situation. Being well established like it is, it will likely be very difficult to shape by this point. If you do wish to make the attempt, then I'd only take 1/3 of the tree at a time. Starting with the lowest point, working up. You'll leave 1 leader. Keep in mind that this will likely never fill out like your typical spruce after this, and pruning will still be constant to remove any growth that starts lower down.

I'd continue to prune as it is if it were me. Some thinning might help, but you want to keep it manageable.

As far as the roots go. I'd leave them, as well. Cutting them would be bad, but covering them up to that point would cause its own problems, as well.

https://www.gardeningknowhow.com/ornamental/trees/spruce/norway-spruce-tree-info.htm