Eloquence includes the speaker's choice of words, expressionistic language and level of language. The more a speaker masters these aspects, the more eloquent he is.
Expand the choice of words. The easiest way to do that is to practically look up any word you do not know in a newspaper or blog article — and put it into a list. Gradually your list gets longer and longer. Every now and then look at your list. And so you get a larger vocabulary over time.
Increase the strength of your language. This is all about the metaphorization of your language. What does that mean? Good speakers use a lot of pictures to make what they say even more vivid. But you do not just develop good metaphors like that, you have to think it over well in advance. We'll be happy to help you!
Increase the articulation. First of all, that means not to mumble. At a slightly higher level, this means that you can clearly hear every single word without having to make an effort. Many people scurry over single words, so you do not understand them well, at least in the back rows. Pick up an audio device and see if you speak all syllables clearly!
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