I would try repoting your plant into a bigger pot. Are you giving it any fertilizer? Light looks good. Water is more tricky. Larger plant in a small pot might need water more than once a week. More of a feel thing. Stick your finger into the soil about a knuckle deep. Do you feel moisture? If not, it needs water. Also, about what is the temp where the plant grows? The most important thing is to not worry, we will get this figured out.
