Nobody is "fluent" the way a light is on or off. You've felt it: one conversation flows, the words just arrive — and the next one leaves you reaching for a sentence you knew yesterday. Fluency shows up in the moments you've rehearsed and goes quiet in the ones you haven't.
So the question was never "Are you fluent?" It's "When you're fluent — why?"
The answer is always the same. Because you've been there before. Because you practiced.