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My two thoughts are overwatering and/or possibly freeze damage. Because your plant is in a container, its roots are more vulnerable to cold weather. You can wrap burlap around the container to help with this. Then in spring, you can plant it in the ground if you desire. Let the soil dry out between waterings, and you don't need to fertilize it.

Here's an article that should help: https://www.gardeningknowhow.com/ornamental/trees/cedar/winter-damage-to-cedars.htm
Here's a more general article about how to care for cedars:https://www.gardeningknowhow.com/ornamental/trees/cedar/growing-cedar-trees.htm

That looks like a job for a professional, and they are near the power line. I don't think those are true cedars. It may be junipers. In either case, they have a dead zone in the center that makes pruning tricky. Here is more:

https://www.gardeningknowhow.com/ornamental/shrubs/juniper/overgrown-juniper-pruning.htm

https://www.gardeningknowhow.com/ornamental/trees/cedar/pruning-cedar-trees.htm

Sometimes, if a tree causes more problems than it is worth... It can be best to let it go.

This is, completely, up to you, but it will open the area up to more variety. Trees like this tend to make the soil very harsh for anything else that might try to grow in the area. Removing the tree will be the first step for the soil to return to a plantable condition.

Here is an article that will help you with tree removal:

https://www.gardeningknowhow.com/ornamental/trees/tgen/how-to-kill-a-tree-killing-trees-in-your-garden.htm

My research says that, with the exception of removing dead branches, this tree should be pruned while it's dormant - anywhere between November and the end of February. Here's an article for you:
https://www.gardeningknowhow.com/ornamental/trees/cedar/pruning-cedar-trees.htm

Here's a helpful article:
https://www.gardeningknowhow.com/ornamental/trees/cedar/winter-damage-to-cedars.htm