The problem with ‘writing advice’ is that it’s like trying to advise someone on how to be funny in social situations. If you know funny people, when you compare them they’re funny in different ways. The methods that they use to arrive at their humour are different, and their jokes are different. When it comes to writing, if you try to think up even the most basic rule – “Write things!” then at times, even that falls down. So I can’t really give great writing advice, nor do I have any idea what it would be. What I can tell you are some things that have helped me to progress in the craft.
You’ve finished your manuscript.
You’ve edited, re-edited, edited until you know every line by heart.
It’s fine, it’s ready.
You send it out.
And then comes the first rejection slip.