I quite like January
What I find helps me is not to start bang on midnight on the first.
We wind down the festive season from 2nd to 5th when we clear away decorations and start from there.
Simple, meaning easy cook, but full of garlic, ginger, spices one pot or casserole meals to help the physical body recover.
A lot of showers are replaced with baths, with face mask, foot pumice.
Good reading material helps.
With adequate clothing outside on a dry day, even if it's cold, you can feel the air go into your lungs, it's meditative and I find frosty gardens, streets, landscapes, hedges really beautiful.
It's a calm time of the year, few social things, no real need to buy.
Good time to plan summer holidays. Make a list of any events you are interested in.
Update your house lighting, paint a room, throw away junk you just clean around.
Like I said it feels cleansing to me. How you personally cleanse, do some of that.