Its been almost a year since i bought this plant and recently its leaves started forming yellow spots and later on withers. At first i didnt pay that much attention since the new leaves were fine, but now the plant just looks sad and i have no idea whats happening. Originally the plant was placed in room where its getting filtered sunlight (now its on window with most sunlight, but its not too bright since winters here barely gets any sun) and watered once the soil is dry to the touch, so it hasnt been over-watered nor dried out. No fertilizers been added since in its care guide it said not to use fertilizers during winters.Is there a way for me to save this plant?
I also noticed that one of my plants that was in the same room got spider mites. Not sure if its the problem.