How do I make it a voluntary block when the block comes?

How do I make it a voluntary block when the block comes? Friends, about 10 days ago, I challenged myself to practice stuttering voluntarily because I have a fear of stuttering in front of people. This is my personal experience. If I want to overcome stuttering, I need to stutter more. By stuttering more, I can confront and reduce this fear. I’m a bit confused about something and want to share it here to get your advice. I want to make voluntary stuttering a part of my life, but I don’t want to stutter unintentionally. So, when I experience a speech block, I want to stop it and turn it into voluntary stuttering. I want to have control over my stuttering. I know it’s very difficult to be fully in control, but I believe I can achieve it, even if only a little. I would really appreciate your advice and comments. Thank you all in advance!