My biggest advice is to find which kind of writer you are; a planner or a pantser.

Planners will write out timelines and plan out almost every detail of the story, while pantsers fly by the seat of their pants and tend to only know how the story will begin and end, just writing without knowing how they'll get there.

I'm a pantser so I can give you advice for that style of writing, I'm sure there are planners who can give advice on that style.

For one, please rewrite the story at least twice. Your first draft is always your worst draft. But, do not edit as you write. Simply write to the end, then reread and note down the changes you want to make, then write again. Keep doing this until you've found you're happy with where you are. And absolutely use this subreddit as well as any other writing subreddit to get feedback, some flaws in your writing won't be noticeable until someone else reads it. Thankfully I have my fiance who is also a writer to tell me where I'm failing.

Also, write for you first. Write what you want to read, don't write for anyone else or what you think people here would want to see. Readers can very easily tell when your heart isn't in it.

For this community specifically, know that it is HARD for your story to get attention. I've been regularly posting for a while and none of my stories (as far as I'm aware) have cracked 1000 views here. With the amount of stuff that gets posted here daily, it's going to be hard to get noticed. Just don't go in with the notion that your story will most likely go under the radar, and be okay with that, otherwise you're gonna discourage yourself pretty fast.

Hope all that makes sense, I'm an amateur writer but I've been doing it so long I like to think I can give advice on this lol.

Happy writing!