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Freelance writers often have deadlines to meet, but even if you write for your own blog or articles to post online it can be helpful to set a writing goal that you aim to attain in a day or within a week.
I set myself goal about how many words I will write every day, from first draft to completion. Some days I do fall short of my target and on others I might end up writing much more, but on days when I at least reach my minimum goal I feel most satisfied. This way I am motivated to write, not by how much money I may make, but how much I can achieve in a day.
I think having a goal setting system is the best way to get more writing done.