Becoming the best version of yourself is a worthy goal. It is also limitless in scope. It is daunting to contemplate all you will need to do to become that person.
My advice is to work on one aspect at a time. A collection of small victories will reinforce your motivation towards the ultimate goal.
1. Watch TV less
2. Read one book a month
3. Try something new every week
4. Cook more meals
5. Exercise more
6. Meet interesting new people
You get my drift. By themselves these would be small victories but together the build the stairway to your destination: The best you!