I believe that there is something that every one can work on in order to improve themselves. Self-improvement has essential external and internal factors that take place. I think when we start being more open to creating new relationships, strengthening old ones especially with God and building confidence to do new things (aka external effort from internal motives) we allow a new potential in ourselves to be unleashed.
It starts with getting uncomfortable. It starts with granting yourself the ability to take on new opportunities. It could be volunteering at your local church or in the community. Taking on a new journey for yourself may require joining a new work-out class, cooking class or any kind of group you are unfamiliar with. It could be as simple as starting to say hi to more people and smiling more often and then just maybe having the confidence to start new interesting conversations. Living life truly and enhancing personal growth starts with stepping outside of your own world and embarking on the world around you. Whatever your comfort zone may be, step on out of it.
Not living for yourself but living to make a difference and seeing the world from a whole new viewpoint is imperative to truly live life fully. Stepping outside of your own realm will also give you the opportunity to learn more about yourself, meet new people and maybe even become acquainted with your new best friend or the love of your life. You never know what will happen until you look outside of your scope of life and into the lives of others. Live life truly and uncomfortably.