First, interact
The best way to tell if your speech is going to go well is to give your speech.
The best way to find out if your new product has market appeal is to try to sell it.
The best way to become a teacher is to teach.
There's a huge need for study, refinement and revision. No question about it.
None of it means anything, though, if you are hiding from the market.
There used to be a dangerous myth: the genius in an attic, who arrives one day, fully formed, with a grant, a Pulitzer and a string of accolades, out of nowhere.
Great work doesn't come out of nowhere. It comes out of interactions with the people you seek to change.