Ended up finishing the lineart for this piece (minus the faces, faces take forever).
Honestly though? What really helps is having good music in the background, and of course time and space to draw.
Can you draw a line a day? Just one line. If you end up drawing more than one, great, but just one line. It's more than zero, and all prpgress is good progress.
If you don't want to think of it like that, set a timer for 5 minutes and turn the end sound to silent, then just draw for "5 minutes".