I belive, the more I think about my stutter and the more power (spending thoughts on it) I give it, the stronger and worse it becomes. Do you stutter if you record yourself and just talk nonsense? If not and its more like me in which I struggle only with conversations (can sing, can read smoother than I talk, can do jokes with a humurous voice or tone) and its really hard to talk seriously, like ordering something, having a normal conversation, introducing yourself, a situation in which you try to be serious in, then you may want to try something that I tried, in which I practice situations on my own. I just talk to myself (since I dont stutter) and I kinda roleplay with myself to build up an arsenal of convos I already played through and importantly, succesfully (since I dont stutter when I talk to myself or in the beginning way less). I belive that can kill speech anxiety and reduces the amount of negative experiences u had speaking in total. Also speaking to other people who stutter can help a lot to get rid of speech anxiety, since I belive that is something that makes everything way worse. I wish you the best of luck bro.