I know this sounds too obvious to be useful, but speak as much as you can. To practice speaking more than the daily conversations you have will require, record

I know this sounds too obvious to be useful, but speak as much as you can. To practice speaking more than the daily conversations you have will require, record some videos. You might pick some technical topics (or whatever interests you) and record screencasts. Listen to them once you've recorded them. You could also share them with people or even publish them widely with the goal of getting some feedback. Good luck with it. I know it can't be easy and I can only imagine how challenging it is to try to become fluent and effective in another language, especially English which is a bastard language with so many exceptions and intricacies!