I’m in a similar situation, but have made some progress. I got into psychology/ mindfulness, and learned to attune to my internal world. This is my advice, because the reason for your stutter is there. What you feel in your body, and what thoughts/images appear in your mind when you enter a talking situation, will reveal a lot about yourself. So, self-observation is the best tool. I also recommend reading the book “speech is a river”, which you can find online. Basically the anxiety, constant dreadful anticipation ,word planning IS a big part of the problem. Speech is a spontaneous process, like breathing, but somehow pws let their conscious mind to take over the speech process and it becomes like hard work. See where you can slowly let these habits go, perhaps in less significant situations first, and with time your brain will learn. Wish you all the best!