1) Read or listen to audios. It will help you fine tune your writing.
2) After you are done with your first draft, walk away, and then go back and read again. You will read with fresh eyes and you will have new ideas to make the story better.
3) Don't fret about 1 star reviews. Welcome to the author world. Bad reviews come with the profession.
4) Don't worry about the grammar when you write your first draft. Just keep writing. Fix that during the second round.
5) Remember you CAN'T please ALL your readers. So write to please yourself. YOU must love your story before anyone else can.