Daily writing is certainly a challenge for many people. Often, I find that having a random word as a prompt can be quite helpful. You simply pick or find a word, write it at the top of your page, and then set yourself a little timer. You might start with only a one minute timer. The important part is the keep writing until the timer stops. Eventually, you'll work up to longer periods of time writing and it will become a part of your daily routine.

Best of luck to you!