Teaching speaking of English as a foreign language to B1 level learners

Start Small (Groups)
Small group discussions provide more opportunities for all students, not just the quiet ones, to participate. There is less competition between students, and the flow of the discussion can be more inclusive simply because there are fewer people involved. For more introverted students, this can feel far less intimidating because instead of speaking in front of 30 kids, they only need to face four. This will also make them more comfortable speaking up in front of the entire class later because they will have had the opportunity to work out their ideas with their small group beforehand.
This was one of the most effective strategies when I was encouraging Vanessa to get involved in class. I noticed that she was starting to feel more comfortable as I used this strategy, and not only was she benefiting from the positive feedback she received from her classmates, but they got to hear the gems of information and insight she shared.
Assign Conversation Partners
Who are the kids that more introverted kids feel comfortable around? Pair them up to discuss the subject or project at hand. Then have each pair share with the class. This way, your shyer students will know that they'll be asked to speak in front of the class, and they'll be able to prepare both intellectually (the material) and emotionally (the courage to share with the class).
Let Them Prepare
Building on the idea of a predictable event, try to avoid putting your shy kids on the spot. Ask the introverted student if they wouldn't mind sharing a specific thought or idea in class at a specific time in the future. This can be something to start a class discussion or a point to be made in the middle of the lesson. They can prepare and be ready to go when you call on them.
https://www.wgu.edu/heyteach/article/encouraging-students-participate-how-help-shy-students-speak1809.html
3.Applying the suggestopedia method for teaching speaking in classroom for B1 level learners?
In teaching and learning speaking the use of method is very important, because it can make the teacher easy to give information or material to the students. The method which can be used is Suggestopedia. Suggestopedia is the method which uses music or videos in teaching learning process. The use of Suggestopedia in teaching learning speaking is much needed; Suggestopedia can motivate more of students’ mental potential to learn and which obtained by suggestion because with this method the teacher can give relax situations, so the students can get the material easily. With music the students can imagine their think and then they can describe their imagination to others. From the activities in Suggestopedia, the students can master more speaking.