The hard part for me is staying on low carb/keto. I find heavy resistance traing (5x5) to be very effective as mentioned. But the periods where I’ve maintained low carb, going into ketosis I’ve noticed alot more fluency, for the whole low carb period. Its fascinating and I hope there will be more studies done in the future with ketosis and stuttering. My advice would be to try heavy training aswell, if you have the time. Its been a life saver for me