Here are some rules that will help you improve the quality of speech:
Read more various literature: popular science newspapers, magazines. A good option to read our domestic classics, which we were asked to read at school. To read it is necessary not hurrying up, to think over each offer. This will allow you to learn how to correctly build words into sentences and increase your vocabulary.
Try to exclude from the speech parasitic words: "well," "in general," "like", "well this", "pancake", etc. Try not to express strong emotions in a conversation. Use simple phrases, take your time.
It is necessary to monitor the pace of speech. Monotone speech causes an insane sense of boredom. Hold a pause and select certain moments with emotions, but not strong ones.
Use various metaphors, comparisons, sayings during a conversation. This will greatly revitalize your speech. And of course, humor. To joke, including on oneself, if it is appropriate in this situation, is not out of place.
In order to train your speech, you need to have a wide range of communication. In its absence, a radio and a TV set are suitable. You can try to imitate your favorite TV presenter: repeat his phrases, copy the intonation.
There is another fun exercise. Take some home item, such as a frying pan and try to talk about it in beautiful literary language for 5 minutes. At first, this process will cause you obvious difficulties, but each time everything will be easier. Gradually increase training time and complicate the topic.