How to give a professional presentation in English

Every manager should be able to make a presentation in English today. However, the idea of ​​speaking a foreign language in front of important people often makes even very capable managers feel insecure and frustrated. They are mostly afraid that they have an unnatural, or even ridiculous, accent in English, they can't respond as spontaneously as in their native language, and so they look stupid. Of course, there is also the fear that the audience won't understand them. How can you overcome these fears and give a great presentation in a foreign language?