Is it as simple as creating a schedule and sticking to it?
I wish
this unfortunately doesn't really work for me.
I think the key is finding what motivates you, personally. This will be different for everyone, but I can tell you some things that work for me. Sometimes it changes from week to week and I have to invent new and novel ways of motivating myself to sit down to write (the joys of adhd!).
-Spreadsheet of word counts that I keep for the entire year. I update this at the end of every sprint (I use the pomodoro method, sometimes 15on/5off, sometimes 25on/5off).
The spreadsheet is full of all sorts of formulas. It counts my word counts for that 28day cycle, it calculates the $ amount per sprint based on my average cent per word earnings, and it also calculates % completed based on the books and predicted WCs I've set out in my schedule for the next two years.
So for example, it'll tell me I need to write 5k today. If I write 3k, tomorrow's figure goes up. If I do 7k, tomorrow's figure goes down.
None of these formulas are because I'm particularly anal about a schedule, it's purely because I've found those motivate me to do another sprint. I enjoy trying to get the average number / day needed down, and I like seeing how much I hypothetically earned in the last 15 minutes.
-For actual sprints sometimes I'll use an app called Focus City that sits in the corner of the macbook and builds a house in your city for every sprint completed. Sometimes an app called Forest, same principle but it's on mobile and it grows a tree for every sprint. I'm that weird person who got highly addicted to FarmVille back in the day so this works for me. Sometimes I'll sprint with others in a room online (either MyWriteClub, or ohwrite.co at night because darkmode). This satisfies the high competition part of my brain, because I can see other peoples word counts in real time.
-I truly believe that any fiction writer worth their salt is a master liar. That's what we do, we tell amazing lies for money. We create false realities using only our minds. So use your skills in lying in order to trick your brain. Lie to yourself that you're absolutely buzzing to sit down and get this done. Practice manipulating your mood. Lie to yourself that this is fun, you're having fun, fun fun fun! This works when I'm having a day where everything is crap and I want to curl up on the sofa and watch Netflix.
-Read. This always, always gets me in the mood to write. Try to read some good books and some terrible books, read your competition and read authors who died twenty years ago. Read what's selling right now, even if it's not your genre. The good books will inspire you, and the terrible ones will inspire you to do it better. I read a lot of openings (the look inside feature on amazon is gold) and a lot of reviews on goodreads (when I've convinced myself I'm terrible I read bad reviews on books I've loved).
-Watch videos on writing / authoring. Author tube is pretty good for this. I find it motivating listening to others speak about writing and productivity. I like HeartBreathings, Becca Syme, Dean Wesley Smith, The Courtney Project, The Creative Penn. Just be careful you don't trick yourself into thinking your procrastination is productivity. I promise myself one video if I finish this sprint.
This is all rather jumbled but that's the main ones I can think of right now.
I am pretty prolific and have high word counts. The most important thing I've learned is that writing is exactly like running. It's not always a comfortable thought, the thought of doing it is often worse than it is, and once you've done it you feel great about yourself. If you don't write for a week, you're going to feel rusty and tire more easily. You have to work the muscle every day if possible. Day 1, 1000 words is going to feel like a huge task. But if you work your way up then I promise 1000 words will eventually start to feel like a doddle. 1000 words is eventually just a twenty minute focused sprint. But the moment you fall off and let things slip, the bigger 1000 words feel.
Hope some of that helps 