I feel for you. I’m sorry. I don’t know myself. I’m afraid I have may have a similar issue.
Is your fuel line pliable? I have one that never stays full if fuel completely. There’s always air in it. There’s a bend in it that seems to be a problem. I’m going to replace it or shorten it.
Is the choke retracting when you shut it off? Maybe it’s sticking on? And causing it to die?
Did you lose the springs in the air fuel mix and it’s backing out on its own?
Take the airbox off and run it without it just to see if that’s an issue?
Not sure any of these will help, but might be worth chasing.