You write without considering that you’re writing for people to read what you write. That way you’re more concerned with what you write than you are with how you write and your writing will flow more naturally.
You also write without considering that you’re really writing, not for your reader, but rather for the editor or publisher (bricks and mortar or online) that will look over what you wrote and decide whether it’s worth publishing or not.
In other words, you forget all the rules of writing you learned over your long and arduous writing education and write what you want. How you want. Any way you want.
Then, when you’re finished —- (of course there’s a ‘then’) —- you go back over what you wrote and figure out what changes can be made so the result will be what people want to read and what those oh-so-important gate-keepers to the writing world will publish.
If you’re lucky, you’ll find a way to make such changes and then you’ll have the best of both worlds, that of the professional who writes to give other people what they want while also writing for yourself.
If you can achieve those goals, you’ll have reached a plateau of meaning and elegance that few writers ever reach.