Some of mine off the top of my head include:

• Write even when you don’t feel like it. Often you can turn that around
• Write regularly
• Trust YOUR writing process, no one else’s
• Sometimes down time is writing too e.g. problem solving, fermenting characters, problem solving
• Writer’s block means something is wrong. Listen, learn and overcome
• Constantly challenge yourself to improve
• Get feedback for your work from supportive people, experts perhaps or a writers’ group
• Read, read, read good writers inside and outside your genre as well as writing books. INVALUABLE!
• Write for you, not for anyone else or fame or money and so on
• That said, your drafts should move from writing to get things out of your system out to considering your reader
• Enjoy writing. Again, if you’re not, look for what’s going wrong and change that.