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High temperatures can cause the bloom color to fade or wash out. Although it doesn’t occur often, if the pH is high, bloom color can become lighter too. Anthuriums perform best in soil with a pH around 5.5. For additional possibilities, this article may help: https://www.gardeningknowhow.com/plant-problems/environmental/fixing-color-faded-flowers.htm

When the plant is done blooming you can repot if you feel it is to root bound.

Only go up 1 pot size so that the plant does not suffer from root rot.

https://www.gardeningknowhow.com/houseplants/anthurium/anthurium-care.htm

The brown papery parts are the remains of leaves that were once on the plant.
It appears the plant had become leggy, likely due to poor light conditions.

Here is a link with more care information.

https://www.gardeningknowhow.com/houseplants/anthurium/anthurium-care.htm

Yellow leaves can be caused by a number of things. Typically in houseplants, it is either underwatering or overwatering. Water when the top of the soil feels dry, but to do let the soil dry out all the way. It could also be developing a fungus (which neem oil can help with).

This article will have some other causes for yellow leaves: https://www.gardeningknowhow.com/plant-problems/environmental/plant-leaves-turn-yellow.htm

It is possible that you have thrips. They are hard to see and they cause damage to the buds like that. They can attack the base of the flowers and kill them before they open. This article will help: https://www.gardeningknowhow.com/plant-problems/pests/insects/controlling-thrips.htm

You can prune your Anthurium at any time of year.
Use sterile garden tools to make cuts.
Remove any damaged or yellowing leaves.
You can then remove all but 4 or 5 of the healthiest leaves to the base of their stems.

https://www.gardeningknowhow.com/houseplants/anthurium/anthurium-care.htm