I have been trying to slowly wean myself off being only fluent when i am alone. I have been talking on my phone in crowded places with no one on the other end of the line, like pretending to have a conversation, and i think that it has made my speech a little better. I just started, so i need to continue to do it for a few months to see if i can really trick my brain into not caring if there are people around me and if they're listening. This has giving me a chance to feel where the blocks are coming from and to stop and start as many times as i wish.