How to persuade parents to agree to travel abroad alone?

Actually, I have the same idea as you. I also want to travel alone, but my parents don't agree, for fear of danger. But you are an adult, you should be able to take responsibility for yourself, so you should convince your parents in your own way. Let them rest assured that you will go. Of course, if you reassure them, you should make all preparations. Ensure your own safety, do your own raiders, and ensure that every step of the travel plan reassures your parents. So they can safely let you go. If you want to go out by yourself and your parents don't agree, don't just refute and object. It won't do you any good, it will only make your parents think you are naive and won't allow you to go out alone. All you have to do is show them your maturity. When you grow up, you can face your life independently, and they will support you in making decisions.