Heena J.

To have fluency in your English speaking practice speaking in English daily with your family, friends or relatives. This will not only enhance your speaking skills but will also improve your vocabulary.

You should also spend some time reading motivational books and watch good English subtitled movies/series. I hope this answer is helpful to you.

First of all try to speak in English with others for fluent English on a regular basis. Let it be anyone, your mom dad friends colleagues etc. Secondly in order to improve your vocab, try answering grammar questions for which you can refer wren n martin book. Start with simple questions to difficult ones. practice daily at-least for one month. You will definitely find changes with your vocab. Thirdly, try expressing yourself, your opinions, your views, get involved into group discussions, so that your problem of being introvert goes off. Keeping in mind the above mentioned ways to improve yourself can bring huge changes in you, if you practice speaking in English on a regular basis. Ultimately it's you yourself who can make changes.