There is a saying that everyone has at least one good book in them, which is very true. Since our personalities and identities have been partially shaped by our environment and experiences we've gone through in life, we each bring a unique perspective that is wholly our own. Add to that specialized training or schools and even hobbies of ours and it becomes clear that we all have something to offer the world. Just go to the library to catch a glimpse at all the knowledge that has been passed from one person to the next over the ages. And you can take advantage of what you know and offer it to the rest of us as part of a profitable business.
A fun little exercise you can try out on yourself is to think of everything specialized you know and get it out of your head and onto a piece of paper, into a computer, a voice recorder, etc. and also include any hobbies you have and pretty much anything you know of that interests you. You'll probably be surprised once you look back at the end and see all that you've taken out of your head. Then go back and start to organize those ideas into groups of like topics and you'll start to see a framework come together for a subject you can teach others about, a service you can offer, or even a new product that could help people in some way.
Many times, we may feel that anything worth offering to the general public has already been done or that there's too much competition for a particular item. Although you should carefully evaluate competitors at all times, understand that you can always improve upon a product or idea that's already out on the market. This process occurs everyday and is a natural way of creatively tapping into something that someone else didn't think of or didn't have the insight that you do to make a better product.
In addition, don't forget to look at what you've done for employers over the years to see if those skills can be easily transferred over to doing something on your own. Even though you may not have liked doing those things for someone else's company, you may find something to be very excited about when you're working for yourself. Use your strengths to your advantage and you'll have a product that you're instantly an expert on and can share with the rest of us.
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