Most emerging speakers, even seasoned speakers, undervalue their experience, so they never get started and invest time to create product. They don’t think they have enough value. If that is you, you're not alone. That is a normal thought that many speakers have, but rarely admit. I felt exactly like that when I started back in 1994.
Even experienced speakers take for granted what they do know. What you know and understand is valuable to people who are just starting out in your area of expertise. What you know is one of your biggest assets!