Things happen! But unless you consciously plan, change may not to your liking. To change your life in a way that is conducive to your desires takes time. There are no quick fixes or short cuts.
The most fundamental thing to do is to think about where you are now and where you want to be in say 1 or 5 years. Be ambitious by all means but be realistic in your goals. The more you plan to change your life the more realistic those plans become.
Changing your life is not a random event. It is a planned event. Even small changes need to be orchestrated. And that means that you need to plan to change your life.
When I look back over my adult life I can see distinct phases of change. But the most successful periods of change in my life has been were I have meticulously planned for it. Where I have set out a goal, written down the things I needed to do to reach it and the time frame and then implemented them.
In short, if you want to change your life, you need to plan for change. What are you waiting for?