I know what you mean by inspiration coming and going. I hear something great or read something and then I forget. Its like my mind goes back to default every morning. I know this so I try to do something for my recovery everyday. It may just be to read something or go to a meeting.
One of the greatest inspirations to me for long term is people who have 10, 20, 30 years plus. I see these people in AA and they continue to go. It makes me realize that it's possible. If they can do it, so can I. But I forget, so I have to keep going to meetings. I forget, and then I am reminded, I forget and then reminded....