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I would add phosphorus to the soil. A lack of phosphorus will cause a lack of blooms.

It sounds like you have thrips. This article will help:
https://www.gardeningknowhow.com/plant-problems/pests/insects/controlling-thrips.htm

You can use a technique called rejuvenation pruning. Basically, you cut out 1/3 of the longest, leggiest stems each year until it gets to the fullness you would like it to again. Do not do more than 1/3 a year. It will not be able to handle more than this.

It sounds like it might have a fungus. You can remove the brown leaves as they are dead and treat the plant with a fungicide. This will take care of the fungus disease.

This winter was difficult on plants and it is possible that it did not survive. This article will help you determine if it is still alive:
https://www.gardeningknowhow.com/plant-problems/environmental/how-to-tell-if-a-plant-is-dead-and-how-to-recover-an-almost-dead-plant.htm

If the stems are still alive, it will regrow its leaves. Just care for it as you normally would.

They only survive outside year round to Zone 6. You can bring them in for the winter though, if you would like to grow them.

You may find our urban gardening section helpful. There are many articles on growing plants in containers: https://www.gardeningknowhow.com/urban