When I noticed that my levels of fluency were vastly different depending on situation and interlocutor, I realized that If I wanted to improve, I needed a holistic approach. Focus on the physical but the hard part is the work on self-confidence and decreasing anxiety. 1. Sleep, diet, mindfulness, relaxation, being active and having a healthy lifestyle is the minimum. 2. Breathe, slowdown, break down the words into syllables are all practical tips. 3. Practice difficult situations to improve confidence and decrease anxiety (you will have ups and downs, but its an upward trend :)