There is a website called 100words. People can sign up and have to write a 100 words every day for a month at least. Regardless of the subject. It can be continuous prose or a 30 different subjects. But every day has to be 100 words. It’s a great concept. I had signed up a long time ago, about 8 to 9 years ago, and I thoroughly enjoyed completing a few months.
The routine of writing every day gave me good discipline and completing the month gave me a sense of purpose. When you really think about it, 100 words is not very long but it forces you to get into the habit of writing and think about topics for writing.
May be I should think about starting it up again.