How to think big

Hello everyone,

This is my first post, I want to start by introducing myself, My name is Leith, and currently planning to start something new. After reading and listening to lots of founders of big companies and reading a lot on Twitter, indie hackers etc. I really got new approach toward business.

I really want to ask an essential question from you all, and I hope it would help me found the answer of it.
I have seen many founders, like Tobi (Shopify), Patrick (Stripe), Steve Jobs (Apple), and Brian Chesky (Airbnb), Melanie Perkins (Canva), etc. who are very optimistic and were able to think ahead of their time. They saw a problem and thought like nobody at the time was thinking or seems impossible for most people. Back at the time, when Steve jobs talked about personal computers and how it can change people's life, nobody believe him and dismissed the idea. They help other people make money by acting as a platform to deploy their creativity and change the world.

I am really passionate about design, art, paintings, and lots of people say that you should solve your own problem in order to build a SaaS or anything. But I am not able to think big and can't really think of a problem that I have or others have. I don't like the idea of doing something just for the sake of doing or to make money, I want to work on something that connects with my passion and something that I can continue to work on that have a purpose.

I am not really sure how to make all this possible, sometimes I would feel everything is done by others and I can't do anything new anymore.
I really need advice about this

Thank you so much for reading :)