I'm not out to discredit anyone's efforts, but if you really want to 'git gud' at writing, there's some basics and advanced stuff that's really important...

Now, what I have to say isn't law, but it's just things that have helped ME, and whether they'll help you depends on your character and style.

The thing I hear about most is deadlines deadlines deadlines! Well, if you're rather new to the written world, you shouldn't be taking deadline based projects. It's nothing to do with your speed, or ability, just the fact that you lack the experience when starting out. Writing is mostly a hobby and it's important to understand that you won't 'pop out the pussy, playin' Mozart', so it's important to gain a level of expertise before trying to sell your work. I'd be absolutely embarrassed to sell any stories I'd written in High School, due to how 'amateur' they are, and my current works still aren't ready for any real trial or tribute. So, write on your own time, and pace yourself so you can learn to take harder requests. Soon enough, you'll be writing with swift precision and build up a nice little audience!

Remember to branch out! There's nothing more common, yet also more repetitive than stories that are just the same thing with one or two things changed. I get it, you like 'blank', but it's very important to learn to find more styles and formats. I'm emetophobic, which means that if you barf near me, I'll fuckin' gut you, but even with that, I can write some of the chunkiest bile spew into existence. I don't wanna, but sometimes the narrative requires something we might be less comfortable with. I've written some fucked up shit, and I've written some absolutely cutesy crap that'll make you shit your brains out from the mere disgust you'll feel reading it, but what matters is that I've written a lot of different things. Variety and versatility are highly important!

In regards to feedback... It's okay for people to give feedback, but it's also okay for you to ignore it. Most feedback is not helpful and is just nitpicking, so remember to spot the difference between calm, guided advice, and someone trying to boss you around. Just keep in mind, if it sounds like an insult, it usually is, and that you don't owe anybody anything!

Research! I often do a lot of research before certain stories, making sure I get the gist or the excessive detail of certain cultures, languages, etc. Always remember! If you know the canon, you can correctly defy it!

Understand that you can't 'do everything'. There will be areas where you struggle and things you just can't write into reality, not like anomalies, but more mental locks that just prevent some of us from writing certain things. There are some themes I'm absolutely awful at, and that's alright!

Take breaks! You won't have any inspiration if you're constantly writing! With no inspiration, your work will be stale and without heart. It's commonly easy to tell who writes what they want, and who writes what they 'think' they want...

Be prepared to fail and overcome it! A big mistake I see is that people think that they can dive into big projects without starting with something more manageable first. I have dozens of unfinished lorebooks, but in each of them are pieces that made me better at writing as a whole. Within those documents is progress and practice, trial and error, and a whole lot of blood, sweat, and tears. Because I've worked on so many failed and unfinished projects, I've had more than enough time to learn to write all sorts of things, and that's not unique! Many great artists and writers exist on a pedestal of broken keyboards and trashed canvas...


In conclusion.

Writing is fluid.
It has multiple facets.
That is a sign of learning.
Improving...
say you write a scat fic torture story and it bombs.
You can't just write the same fucking thing, hoping it'll do better...
When I was working on the Werewolf 'hide and eat' story, I realized that I couldn't. But, after writing the corridor scene in the Space Pirates series and the Dungeon scene in the Minotaur story, it was like something clicked. I could map out the entirety of that office building without fault.
This is because I learned by branching out...
You don't start by making Elden Ring.
You make a couple shitty phone clones first...
Stretch your boundaries, but do not escape them, and you will find yourself gaining in precision, speed, and ability faster than you can even type!
You'll be writing one thing and your brain will feed you forty other things, and soon you'll be bouncing between tabs with every "So that's what was missing!" you blurt out.
Experiment, toy around, look for peer feedback, just don't let anyone 'tell' you what to do...
Telling is strictly for comms and trades.
People with no stake, have no authority...

I hope that this helps you in any way with any creative roadblocks you might've been having, but also helps you understand a lot of my process.

You're capable of great things, you just have to seize that greatness and remember to keep those who helped you get there in mind, because they're just as important...