Oh, oh, I remember! There is something I felt really helped me become a better writer, and that's having a 'loose tongue' (loose pen? loose keyboard? hopefully you get what I'm trying to say XD)
Basically the ability to write down your thoughts, even if you can't find the right words for them. To just get stuff down and be okay with it sounding cringy, or not quite what you envisioned.
I used to have these ideas floating in my head but I couldn't think of the perfect way to describe them, so I thought 'if I don't know what actual words I'd be writing, why bother pulling out a notebook just to stare at it for 10 minutes?' And I'd tell myself my lack of motivation to write down the idea can be used as a selection process; if it was really such a great idea, I'd still be thinking about it days later and eventually muster up the motivation to write it down. If I forget about it, then it wasn't such a great idea to begin with and nothing of value was lost. Basically survival of the fittest, but for ideas XD
But what actually happens is you have a great idea, and days later you remember that you had a great idea, but you forgot what it was! But you remember the idea was definitely great, and oh if only you could remember just what was so great about it, and you regret not writing it down because you just know it was a good idea, even if you wanted to believe you'd only forget things that aren't worth remembering.
This is why people recommend journaling, at least for a little while - to loosen up your inhibitions about putting words down on the page. You don't have to stick with it forever; I dropped it like a hot rock because daily life is boring and I have absolutely no motivation to record it XD But after that period of journaling, there was just this sense of momentum where, whenever I had a thought I felt was interesting, I just feel a force pushing me to get out my laptop and write it down, to the point where sitting still and not writing it down or trying to focus on a different task before I've written it down takes active effort. There's still a bit of inertia; I don't instinctively and immediately reach for the keyboard, but it nags at me strongly enough that more often than not, I eventually do XD Basically it's to get you into the habit of braindumping :]
This might also be why I've never managed to write anything substantial with pen and paper. I need to play fast and loose with my format; to add and delete paragraphs on a whim, to 'comment out' obsolete pieces of script but leave it where it is in the document in case I change my mind about it being obsolete. Being secure in the knowledge that anything I do can be easily undone is huge for me in letting go of inhibitions.
I also find it helpful to not worry too much about grammar, actually. Being comfortable with typing down a grammatically incorrect sentence that nevertheless describes what you're thinking in a way you can understand is essential, because sometimes a certain way of phrasing things captures the spirit of what you're trying to write, but if you prioritise grammar, you might change the sentence structure in a way that fundamentally changes the spirit of the line and then it's lost. It's easier to have a grammatically incorrect line and fix its grammar than to have a line that has lost the spirit of your vision, and later trying to recapture that vision!
