What is the best way to focus on a topic of a memoir

I would say the correct answer is to a sk yourself questions like who, what, when, where, how, and why.

If you focus on these questions, it will be easier for you to stay on track when it comes to what the topic of your memoir is going to be. It is easy to get sidetracked, but if you focus on these questions only, your job will be much easier.