English Interview

This afternoon, I had a phone interview in English with two Germans. I was a little shy because I am not familiar with the German accent, which confused me in the beginning. Generally speaking, I could understand what they said, as it related to to the content of my work. I realized that I can't easily convey/express my opinions (or speak/converse fluently). Every day I always practise my listening comprehension, but I have no other chance to communicate efficiently/effectively with native speakers, so I seem to make little progress. How can I improve my English speaking ability? Can you help me with it? 

Great work! I think one has to use the language every day in order to become fluent. Find a teacher or language partner on italki! It is also good to talk to different people so as to adapt to different accents and patterns of speech.