Why isn't none of the speech strategies my slp taught me not working?

Why isn't none of the speech strategies my slp taught me not working? My stuttering is semi severe and I think it's getting worse. I mainly have blocks but lately it's become repetitive sounds like "c..c..c..cc..can" but everytime I pause and try again I just go into a severe block. Everytime I try to use a strategy I just block and can't move my mouth and no air is coming out of my throat. Can someone explain to me whats happening? And don't tell me some bullshit like " well strategies are only supposed to improve your speech not cure your stutter" because the strategies are not even working at all.