how can improve my fluency in english?

Answer 1

Practice reading and speak whenever you get a chance.
Practice makes perfect.
Good luck!

Answer 2

Speak in english to those who speak english. Watch North American /British television shows, english differs between Canada, the US and the UK however, so it depends on whose english you want to speak.

Read books and magazines in english, listen to the radio where there are english speakers and not in your native tongue.

Answer 3

Read. A lot.