You've heard the saying: If you want to speak more, you have to speak more.
So I'll make it short and sweet:
STOP WAITING to get booked to speak on stage!
When I first started speaking, I made a commitment to speak every two weeks. Even in my own living room, even if no one was there (yes that happened)
This allows you to get the reps in. These might be the hardest speeches you do (which is why most people are to embarrassed to do this) but if you can conquer this, other stages will come.