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Insect pests rarely affect this plant. Could you describe the damage you are seeing, as this will help us to better diganose the problem or pinpoint the cultprit responsible.

You can trim back foliage as it begins to decline or any old growth, but don't cut it back entirely. Leaves a few inches of foliage on the plants. Also mulch around them both to conserve moisture in warm temps and protect the plant in cold.

These plants prefer loose, humus-rich soil that drains well but will actually grow in nearly any soil type. They are quite adaptable. Amazingly, I had one grow in not-so-great red clay that I amended with compost.

Cut the stalk down to the spot where it emerges from the main stem.

The advice you received upon the purchase of your plant was correct - it is recommended to keep the crown of the plant (which is very sensitive to cold) protected in winter by at leaving a clump of foliage around it. With the advent of warmer weather, you can prune them down to within 2 or 3 inches from the bottom and remove any dead leaves and stalks. Poker plants can be divided in spring or late fall for new plants.

For more information on the care of red hot pokers, please visit the following link:

https://www.gardeningknowhow.com/ornamental/bulbs/red-hot-poker/growing-red-hot-torch-lilies.htm

Your plant does certainly seem thin and spindly.
I do feel that relocating or amending the soil in this area to replant are both good options for you.
You may want to wait until fall to do this.
Make sure your soil is well draining.

Here is a link with more information.

https://www.gardeningknowhow.com/ornamental/bulbs/red-hot-poker/growing-red-hot-torch-lilies.htm