Creative acts require a decision to complete;otherwise they can go on forever. That is:that novel you’re working on won’t ever be finished. Even if you see it in print you’ll still have edits &additions you’d make if you could.
The difference between ‘published’and ‘not’is your decision to call it done.
Here’s a trick:whatever you’re working on,break it into pieces. However,be sure that those pieces have definite ends based outside of your head. Sticking with the example of a novel –try writing like the serial novelists of the 1800′s. Dickens published a chapter at a time. He had a monthly deadline to meet;one that he chose but,once chosen,had to be met every month lest his publisher and readers take serious issue with him!
Whatever your creative endeavour…remember the wisdom of Glengarry Glenross: