You might have to just get used to it
I use January as a bit of "down time" to rest myself after being stupidly busy in the last 2 months of the year.... take some equipment/machines apart and service them... also to plan my year ahead, do lots of things I've been meaning to get around to doing... clear my desk and do a lot of boring admin stuff that's been building up.... most of all get some marketing planned and executed to kick the spring cleaning season off.
I don't mind running at 50% capacity for a few weeks, in terms of time out there cleaning, I think it benefits my business for the rest of the year because I get a bit of time to do things I wouldn't otherwise do if I was busy 12 months a year.
After a few years you learn to stop your ringpiece twitching and just feel assured that it's only a little quiet spot