Don't worry. It'll sit and sulk a bit while it decides on where to concentrate it's growth, then it'll take off. Watch the watering -- it's not transpiring out of the leaves any more so it won't need as much for a while. It will respond and start to grow when ambient temperature goes up a bit more and sunlight becomes stronger.
I don't think you should fertilize until new shoots begin to grow, unless you think the soil is REALLY depleted. But the plants still have the pits to draw from so I kind of doubt it. ... It's kind of hard for me to give fertilizing advice because I only use organic compost mix for soil, water with compost tea, or used coffee ground rinse water, and put earthworms in each container to take care of fertilizing.
If you want it to respond more, see if you can give it some supplemental light. I use a clamp on utility light with 100W equiv. CFL bulb turned on in the morning and off at bedtime.