It certainly helps to practice speaking in whatever situation is available to you even if it means speaking alone. When speaking with others it is important to keep in mind the flight or fight responses. It is true that stuttering is a function of your evasive complex of behaviors. So you should use whatever opportunity you have speaking fluently to experiment and strengthen your assertive side. You’re going to need some safe space to practice and gain confidence as a fluent speaker. Then you will be able to switch to assertive speaking at will. Moreover you have to switch to your assertive side in all aspects of your life. Simply put stuttering is hiding. That’s why at times you need to practice voluntary disfluency. Not in a way that’s lazy but rather intentional. That’s taking control of fear. Take control of your beliefs as well. You have to accept that vocal imperfections are normal and not something you have to conceal. Keep up the good work.