Change is hard and changing your mind is even harder. When you are writing or thinking about what you're writing, you may need to take time to let your thinking change to incorporate new ideas, include new information or assimilate feedback. You may even surprise yourself when you succeed.
Let your work evolve. This may mean discarding large chunks of what you have written. No, you didn't waste time writing what you discarded and yes, you just might use it elsewhere.
BE NOT AFRAID or be afraid and do it anyway.