Fluency is topic-shaped
A level is a useful thing to have. It tells a school which group to put you in, it gives you something to answer when people ask, and most of the time it’s roughly right. But it doesn’t tell you which conversation is the one you’re going to get stuck in.
You can talk about your work for an hour — opinions, jokes, the parts that annoy you — and then forget the words trying to order a repair, describe a symptom, or explain why something is late. Same person, same day, and nothing about your level changed between these two conversations.
That’s exactly what happened to me in Georgia. I’d been learning English for years and could hold an everyday conversation without much effort. Then I got the flu and had to describe the symptoms at a pharmacy. I only knew them in my native language, so I had to use Google Translate.
Actually, there are hard topics in your native language too — explain how a mortgage works, or what exactly that noise in the car is. You get through it anyway, because when the precise word doesn’t come you say it some other way and nobody notices. In a second language you have far fewer words to swap in, so the same gap stops you.
Input doesn’t close this on its own, either. Nobody makes a twenty-minute video about having the flu, and if someone did, it would be quite boring to watch. Usually the topics you get stuck on are the ones nobody talks about: too ordinary to be interesting, or too specific.
So, the second answer is practice. The more you speak on a topic, the easier it gets. It won’t fix your grammar, but it will make the words arrive when you need them. That’s the goal for OkeeTalk — enough variety to cover as much as possible of the boring, rare things you actually run into in daily life.