The Sheer Weight of What Is Not Yet

I have a thousand pages of unformatted, unfinished adventure material. I have projects on the brink of being finished... but they have languished so long now that I'm not sure I remember what I had intended for the unfinished parts... 

Momentum is an amazing thing when it is working for you. 2018 was a banner year for my productivity - 2019 was decent and then... I've been writing, but it's unfocused and incomplete.

The sheer weight of what is not yet is overwhelming. 

How do you get that flywheel turning again? I know that it's about discipline. About writing every day. Just like I know about eating right and exercising. Knowing isn't doing...