You have a clean slate every day you wake up. You have a chance every single morning to make that change and be the person you want to be. You just have to decide to do it. Decide today’s the day. Say it: this is going to be my day.
To inspire a singularity of focus, a challenge must be important to you and it must be something you feel you should do now in this moment. If it's trivial or not time-bound, you won't engage. So in selecting your next challenge in life, choose one that is meaningful and will demand your complete concentration.
Your ultimate life experience and legacy is being built moment by moment, day by day. Your story is being crafted by your every action, all leading somewhere, all leading to what one hopes will be a magnificent crescendo.
People are remarkably bad at remembering long lists of goals. I learned this at a professional level when trying to get my high-performance coaching clients to stay on track; the longer their lists of to-dos and goals, the more overwhelmed and off-track they got. Clarity comes with simplicity.