Hmm, well, there's different things you can do. Repeating positive affirmations and visualizing you speaking fluently in specific situations are two things I do regularly. Reading aloud has helped massively as well – I do 60 minutes a day and try to really listen to my voice and my fluency as I'm speaking. Also, generally and probably most importantly for me: Celebrate the small victories!! What ever your goal is – whether it's using a certain speech technique or overcoming your anxiety and not holding back in a conversation, make sure you give yourself a pat on the back!