As is the case with most things that I say, this is stolen. But this isn’t stolen from another writer, this is stolen (and adapted) from a music video/film guy friend.
If you want to be a writer (professionally and not just as a hobbyist), here’s a litmus test for your dedication. Can you get up early and write a short creative sketch of the sunrise (oh, say, 250 wds)? Then can you do it again tomorrow? And the next day? Can you write 30 descriptive sketches of 30 consecutive sunrises? The simple exercise in discipline is hard enough, and it will tell you just how much you actually want to write. But on top of that, the writing component is quite difficult as well. How do you see the sunrise in a new way every morning? How do you express it in a new way? Can you get through the verbal cliche-flailing, and actually create 30 distinct scenes?
Adapt the exercise if you want. Stand in the same place every night and try to sketch 30 consecutive midnights. I have one student doing daily sketches of the same glass of wine. If you do try to do this (no matter how good you might already be), you will learn a lot about yourself as a writer, and you’ll have to move in new ways through the English language. Get off the worn footpaths of description. Kick through walls. Climb fences. Trespass.