What if the brain reacts slowly?

Speak often, and start with what you have to say. When you gossip constantly, you can calmly answer other people's questions, and then you can slowly change your speaking habits. It's not that you are slow, but that you don't like to talk.

I suggest you play an active and nervous game, which will stimulate your reaction.

Dance companies, go-karts, etc. You can try, but don't get lost, hehe.

You can also get up early, take a deep breath and walk backwards to clear your head!