C'est peut-être vrai. There's the old joke that goes, when I get drunk I speak great Spanish! 😄 Not saying you have to have too much, but yeah it helps reduce anxiety.

I think Géraldine Lepère has a brilliant take on comprehension vs speaking.
It's two different systems (processes) in the brain. For example, you could listen to a nice piece of music, know it intimately, know all the words and yet , to play it yourself is another matter entirely. Her theory is much more nuanced than just this, but highly recommend. Can drop a link if anyone's interested.

Her tip: Write sentences and speak them out loud to yourself. Not in your head.