No advice since I haven't been able to practice this much since covid started, but just a lot of sympathy because I am the same. I often feel like my speech is getting better and then I get into a group situation and no, no it has not gotten better at all. People speaking over me, not being able to say what I want to before the conversation moves on...ugh. And I feel like going to speech therapy is pointless, it was pointless when I was a kid because rehearsing speaking to someone who is giving you their full attention has no effect on the far bigger problem of, ya know, everyday life. /rant I still remember one time, in a car with three friends about 10 years ago, I was trying so hard to get some words out in the back seat, the two in the front started talking over me and the other one in the back sternly interrupted them to point out that I was still talking. Sadly it's rare to have someone stick up for me like that (and frustrating to need it).