You may need to refresh the soil that is in your pots. Three years with no attention is a long time and the potting mixtures that are often used don’t really have much organic matter in them. Also, many of the nutrients will probably have leached out.
I tend to use one of the granular slow release fertilizers. I usually add a small amount (about a teaspoon) to my pots every few months. But, I would look at replenishing the potting mixture currently in your pots.
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