Speak slowly so others understand you better.

 

One way for foreigners to understand you better is for you to speak more slowly than in your native language, to look at people in the eye and to open your mouth wide so sounds are clear.

  

However, do not increase your volume. Shouting will not help and it will make listeners uncomfortable.

 

Look at Andrew’s books on how to improve your business English here https://www.amazon.es/stores/Andrew-D.-MIles/author/B00B0NF18W and study business English at Andrew’s school here https://www.englishforbusiness.biz