How often do you water? Is it indoors or out? You only need to water the plant once per week. My S.O. had a plant when we met that was barely alive. I started taking care of it and it now it's gorgeous. All I did was water it in the beginning, but eventually I started to give it epsom salt once per month, and occasionally I give it potassium to encourage it to bloom.
I suggest you stop watering yours for now and let it dry out. Trim away the old leaves and let the plant rest. Is it very warm where you keep the plant? Is the plant in a container? If so, how large is the container? How big is the plant? How much sun is it getting?
The plant will let you know if it needs water because it will start to droop. The moment it starts to droop give it a cup of water. It should bounce back within a day, If not, you'll know it needs a little more water.