Zephyranthes does not grow

I've had zephyranthes growing for about 3 years now, but it's not growing at all. Every year it blooms in the fall, but then its leaf-stems turn yellow and wither. New ones are also appearing, but not many. What am I doing wrong? Or has he already grown enough for me? Over the years, it has increased 3 times the size of the one in the photo.

I also have Zephyranthes. Obviously you are not taking care of it correctly. I see that the pot no longer fits. It should be wide, but not deep, then the plant can move wider. It is important to provide it with sufficient lighting, but not direct sunlight, and fertilize it once every 2-3 weeks during the period of growth and flowering. Watering is moderate, without stagnation of water with good drainage.

But this window, in the photograph, on the windowsill of which there is a flower, which side of the world does it face? To the south, I take it? Move to the east side. We've already written to you about the potty. I won't repeat myself.