I believe this is a "romantic idea" about creativity (and composition). The fact is that the more techniques you know, the more musical languages you learn, the more theory you understand.... the more tools you have to expand your "freedom".
What happens is that in the process of learning, many people get stuck in particular issues he/she is studying. With practice, time and experience, there comes a time when everything you learn is at your disposal. But this doesn't happen in a month or two... Years... I'm sorry but craftsmanships need a lot of time, and they include techniques too.
When. you master all this things, you can pick the elements you want to express something. Then your freedom is intact and expanded.