Writing is a job. You have to go to work regularly or the work simply will not get done. If you're working full-time, set aside a couple of weeknights and part of the weekend in which to work. Otherwise, you should be working at least five days a week for at least two to three hours. Remember this: if you didn't show up for work, you'd be fired. If you don't show up for your writing work, you lose, too. You won't be a writer.
Right now, I'm only finding about 3 or maybe 6 hours a week to work. This reminds me I have to do better, even when the wee ones aren't cooperating.