I have had these Christmas palms for over a year. They grow underneath a western skylight. They are in the original black, nursery pot. Is it fine as is? If it should be repotted…what time of year is best? ( I plan to repot in the slightly larger pot it sits in)

I water once a week with a weak solution of Foliage Pro. I spray the leaves daily with water to prevent spider mites. Is there anything else I can do for these palms? Thanks