Mojo comes and goes. Oddly enough, my tends to slack off after Christmas when it's "quilting weather" here on the East Coast.
I find a few things help if I want to sew but don't know what:
-I sew strings together, a simple string block using scraps I try to keep ready and waiting (cut and ironed, not wrinkled)
-clear off my cutting table
-go to bed early Friday night, and if I wake up early Saturday and feel the urge to sew, i do
-do something for 15 min in my sewing room that will show improvement in the space (declutter, refold fabric, pick up all debris off floor, whatever)
- give myself a date to start a new project and, whileI'm waiting, find the pattern that inspires me
-make one block that's new to me. Doing a new thing sharpens the brain and boosts creativity
But those are just things that MAY work and HAVE worked form time to time. Don't feel guilty. It's a hobby. Nothing says you have to be producing all the time. Even the trees aren't blooming during winter. They're getting ready but aren't putting on much of a show.