Your plant doesn't need any fertilizer at this time and I think your problem is a watering issue. Your plant looks like its under watered in those new photos. The best way to determine what state the soil is in, is by very gently tipping the plant out of the container very gently. If the soil tries to crumble when you tip it, that means you need increase watering frequency. If the soil is real wet in the roots then you will need to allow more time between waterings. When you water, water until you get a tiny bit of water to come out the bottom drain holes and stop. Don't let the plant set in water in the watering tray. Then allow the top inch to dry well before watering again. Write down when you water on the calendar, so you can learn what the watering frequency will be. Good luck and thanks for sharing.