Writing helps you to generate new ideas. One leads to another and so on and so forth. Here’s a blurb:
I think it’s far more important to write well than most people realize. Writing doesn’t just communicate ideas; it generates them. If you’re bad at writing and don’t like to do it, you’ll miss out on most of the ideas writing would have generated.
Paul Graham — Writing, briefly
We assume that we need to crank out novels to be able to “write effectively”. It is far from the truth. Just write what you feel is good enough and find meaning in what you have written. If it makes sense to you, it ought to make sense to others!