I've been writing for a stupid amount of time, and have always had trouble. I've tried a lot of different "standard" tips but I've only recently actually managed to produce anything of length.
I'm just really happy about that, so I thought I'd share what I've started doing that has actually produced results. Anons share too.
>1: storyboarding
I'm getting the obvious one out of the way first. Do this, but autistically. I have a bad habit of getting inspirations for scenes completely out of order. To connect the scenes, I write things like
Scene 1
-walks outside
-meets character b
-character is bending down to pick something up
Scene 2
that way, I can go back and fill in each part of the story as I think of it, without losing the plot.
>2: color
I've started using colored text to indicate stuff. Instead of getting hung up one something I really hate and losing momentum in writing, I just highlight it a color. It's basically shorthand for "fix this". I've got another color for "cut this out" and another for "maybe change this/maybe not" Being able to just skim back and see what needs work is really convenient, and being able to to turn colored words back to black is really fucking satisfying.