Fear is our body’s response to a dangerous situation. Today, our body may feel fear for situations that are rarely dangerous, such as public speaking and elevators. To overcome it, one solution is exposure therapy. This is where the therapist “exposes” you to what makes you scared in small doses. When you overcome it, they increase the dose until you completely win.
If you want to overcome public speaking, taking educated risks, or anything like that, you simply have to expose yourself to these situations until you overcome it.
You can read more about fear from Psychology Today.