I would wait for now. Overwatering leads to the cells bursting. Unfortunately, this damage to the cells is irreparable. The affected areas form necrotic spots and may die off. Your plant doesn't seem to be dead or dying. So I would wait and closely observe how the new growth, meaning fresh young leaves, develops. It looks like something might have nibbled on the little one 🤔 I would set up yellow sticky traps and see what's lurking around. For now, stop using the neem oil. It's not bad, but unfortunately not very targeted either. I consider its use to be ineffective as a preventive measure 😅