Now, bear in mind that I've written a lot, by which I mean several rough draft chapters and a whole lotta awesome backstory research.
I don't struggle to have motivation to write: I'm always motivated. If you lack motivation, READ THIS, and then tell me you don't want to sit down immediately and start typing. (p.s. Scalzi is awesome)
So, if I've been writing and I've been motivated, what's the problem?
I'm not always exactly sure where my story wants to go. That's the only thing that can keep me from accomplishing forward movement on an MS. And basically, it's my personal tell that I need to step back and do some more research/thinking. Or simply sit down and see what comes out on the keyboard. Just because I fancy myself a plotter doesn't mean I'm not really a pantser (I am, actually).
What are your writing struggles? And what do you do to overcome them?