The winter blues? I think/hope that you will start to get your mojo back over the next few weeks as spring approaches.
My mojo is so far away that I can't even remember it going!
I dream of a 65 mile winter ride! I did a mere 6 km ride on 3rd Jan which left my poorly lungs seared by the cold air so I stayed off the bike until today. I did an even shorter (4 km) ride today and...
... my lungs
still didn't like the chilly air! On top of which most of my fitness has gone and I have put on a couple of kgs over Christmas/NY.
Still, this is typical for me. I become even more of a recluse than usual from the start of December to the start of March. I start to get back into cycling around then.
I'll just try to do what I can and build back my fitness back up over the next month or two. Hopefully, by then a relaxed pensioner, I will be fit and cheerful enough to get a good spring, summer and autumn in.