It might sound kinda counterintuitive, but tongue twisters have been a great help to me! I do them slowly, but I’ll just say them over and over again, normally with increasing speed and clarity (over the course of time, of course). I always do them in private, because the pressure of someone hearing me bothers me a lot, but it definitely makes me feel more confident going into social situations knowing that last night I managed to do a specific tongue twister three times in a row or whatever without having to start over. When doing TT featuring sounds I especially struggle with (mainly r sounds for me)I tend to try for shorter ones, because I’m more likely to make it all the way through often, and that sense of accomplishment helps me a ton! “Literally literary” has become almost a mantra for me tbh, and I’ll just. Mutter it to myself occasionally, throughout my day.