This is my sixth Holidays season on Etsy.
Sales usually slow down after Christmas, but pick up in January.
Many people get money as Christmas presents and they are keen to spend it.
They also start buying for Valentine's day, weddings and of course the usual reasons, like birthdays or treating themselves.
The reason why many shops have low sales in January is that they were busy with sales in the previous months and sort of neglected their shop (introducing new products, stocking up on regular products, promoting, etc.).