If there's one thing I've learned from my 'mature' children, it's to FOCUS.
Every writing project I begin, I drift ... I want to expand - usually before a key thought is fully considered or a core product is fully designed and completed. Possibly because of my need to 'grow' something but more probably because of my lack of concentration and my craving for change and search for something new. Of course, expanding too soon could be detrimental to the quality of an initial story, series, concept, product, goal etc.
So now, the minute I feel myself drifting, I just remind myself to FOCUS - I bring myself back to the main point of what I'm actually writing/doing/creating/developing/, where I'm up to, what's supposed to happen next in the development process, keep the end result in mind - Basically, I remind myself to take one key idea to fruition rather than going off at a tangent with other thoughts, designs or products.
I've banned myself from entering writing competitions. I'm not allowing myself to search the internet for writerly workshops but have attended a couple of start-up business seminars. I don't drift into random poetry scribblings or short stories ... I am ... dare I say it ... more focussed ! Finally, I'm getting further with my writing process.
Of course, you might argue that focussing intently on one thing might limit creativity ... limit all those random ideas flitting about in my head, limit the chances of bringing something else new to the ... market ... hmmm ...
Back to the drawing board ...