"I have even lined up speaking gigs at conferences in my vertical (no idea if I'm actually going to be any good at this)." Toastmasters International is your f

"I have even lined up speaking gigs at conferences in my vertical (no idea if I'm actually going to be any good at this)." Toastmasters International is your friend. They exist for this reason. Find a local club, visit, and see what you think. Really, whether you are naturally awesome or terrified you owe it to yourself and the audience to polish your speaking skills.