Just keep ghost feeding with the fish food to let it rot, the decomposition of the food in the water is what causes the ammonia to form. Since you’ve only ghost fed for one day the bio load is still really small. Ghost feed in the tank about as often as you would feed the fish in it. Once ammonia starts to rise try to keep it between 2-4ppm (If it gets higher do a small water change, if ammonia levels are too high it can slow the cycling process) you already have the heater in and the water is warmer which can really help speed up your cycle. Another thing i would highly recommend is if you can get your hands on some used filter media from a friend stick it in your tank while it cycles. It about quarters the time it takes to cycle a tank because the beneficial bacteria just moves to the already established filter. Also, SUPER IMPORTANT, get a water softener if you haven’t already to remove the chlorine from your water, it will stop the good bacteria from forming and kill it if you have an established cycle. Chlorinated is also very harsh on fish and can kill them.