The most important suggestion that I would make to a struggling writer is to write, and to keep writing. Practice! There are no tips or suggestions that can replace the need for and value of putting words on the page.
Put words on the page. If you don’t like something you wrote, put some new and different words on the page. If you do like something that you wrote, put some new and different words on the page about a new project. The more you write, the better you will become as a writer.
But that basic tip–that a writer should write–is almost trite and provides little guidance. More detailed tips and suggestions to help in developing a successful writing practice are provided in this area of my website.