There’s an idea that I tried out several times in the past. Then, I discovered that Kato Lomb suggested it too. She is a world-famous polyglot from Hungary.
What you do is to converse with yourself from time to time.
You do that, because it isn’t always easy to find someone to talk with. And then it often makes you nervous. And although you don’t actually learn anything new by doing it, (you are not a rusty machine that a drop of oil will free up) you DO develop your speaking muscles to some extent.
Anyway, Dr Lomb recommends it, so it’s probably worth trying.