If you have experience in one area of life where you solved a problem that many others have, then you might want to specialize in that area. For example, if you taught yourself some ways to get through a divorce amiably, you could coach others on how to do that. Or, if you developed a technique for recovering faster from cancer treatments, you may want to share that with others.
Or you may have training in a specific area. For example, you took a training in how to help someone change their diet by using specific techniques you are now certified to teach. Then you may want to use a specific title for your coaching, such as "Massey Method Coach."
But if you want to coach a person in all areas of their life, then you may want to call yourself a "General Life Coach," a "Personal Growth," or a "Personal Development" coach.
No matter what you choose, your job as a life coach is to motivate people to take action to change their lives for the better. You do that with methods, processes, accountability and inspiration to do the work. The problem is that most people want change, but they don't want to do the work. So they hire a life coach to help them stay motivated while they do the hard work.
In fact, about 90% of people pay for life coaching just to hold them accountable. But they also want you to be an expert in the area they are working on. So it's important for you to get proper training.
Notice I didn't say get "certified." There are many certification programs for life coaching. But there are also courses that aren't for certification but may be helpful. So just be aware of that.