Don't get too hung up on how you write if you aren't also considering what you write.
Do whatever you need to do to get through it. The writing will be patiently waiting for you on the other side.
If you have trouble staying hooked on your longer projects, take a step back and think about what you find interesting about writing.
Moments of grounding are necessary to make a work feel meaningful and satisfying. Otherwise it's just beautiful meandering.