If your plant has roots escaping out the bottom of the pot it needs a new larger home.
If the plant needs to be watered more than once a week the pot is likely too small.
If the plant is no longer growing well it probably needs fresh dirt.
If when you water the plant the water pours right through rather than soaking into the soil first then draining you probably need a larger pot for the plant and fresh soil.
If it has been in the same dirt or moss for more than a year it likely needs new moss or dirt.