In most cases, there are already other people doing what you want to do.
Whether it’s a type of business, a personal brand, a type of lifestyle that you want to live, or whatever else.
So, you don’t need to start from scratch.
You can model your idea on what others are doing to get ideas on how you could be doing it in your own way.
Note though, it’s about modelling others. It’s not about copying others.
See what’s working for others and find your own approach to doing it. Add your touch, your personality, your knowledge, and your skills to your idea.