Unfortunately it comes (mostly) from knowing your audience. You can get into training design and it will help a fair bit, especially if your setting allows for

Unfortunately it comes (mostly) from knowing your audience. You can get into training design and it will help a fair bit, especially if your setting allows for interaction with audience, which lets you check if they 'know' something. It will not, however, do as much as practice. Unfortunately again, knowing your audience comes from talking to them a lot. Best public speakers tend to be saying the same thing for years (hundreds of hours of saying a specific story, for example). There is no objective encoding. Cultural component tends to be bigger than expected. Your model is, largely, wrong. Firstly you want to be able to model minds of your audience, secondly you want to be able to provide information that shifts that model into a model that you want them to have. Only then 'thinking clearly' comes in. Your model could work for teaching people known well agreed upon steps in a field they know nothing about and one could get better at it with practice. Unironically get on twitter (or tiktok, I guess) and practice delivering one specific message.