Skyscribe is a tool made with youtubers, and any kind of presenter or video producers in mind
It will improve your public speaking with techniques to structure and compose your script.
It also has a free teleprompter with video recording ability.
I did a course about songwriting and also read several books about techniques that great writers use to divide the creation of a final work in several manageable steps, that's why you have several tabs in the app to work on each of this steps