What Are Five Ways in Which You Discover New Problems That Are Not Yet Solved?

My name is Kiril Gantchev, I'm a serial entrepreneur. I've run multiple startups and I'm looking for the next big challenge that I can try to solve. Here is my LinkedIn profile: https://www.linkedin.com/in/kgantchev/ ProductHunt is a great place to discover new products that solve a problem. However, it's still difficult to discover new problems/challenges that are either not solved or the solutions could be greatly improved. What do you do to find new challenges that need solutions? What are the top 5 ways in which you discover new challenges? If you're OK with talking to me, then I'd be super thankful if you can share your contact info with me and we can schedule a quick interview so I can understand how you go about discovering new problems. I'm sharing my schedule for anybody that's willing to spare 20-ish minutes of their time so I can interview them. Please feel free to either book a slot in my schedule here: https://calendly.com/kiril-gantchev/30min Or share your contact info here and I will reach out to you directly to schedule a chat: https://airtable.com/shr4JzksAexURHjdq